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ON LUYEN TU TAI I Phan Chung cho tat ca c^c thi sinh: (32 cau, tir cau den cau 32) Cau 1) V$t dao dpng dieu hoa theo phuong trinh: x = 5cos(20t ~ (^^)- Toe dp v§t CO li dp X = cm la A 40cm/s B 60cm/s C 80 cm/s D lOOcm/s Cau 2) Hai dao dpng dieu hoa cung phuong, ciing bien dp, cCing tan so, c6 pha ban dau la (pi = — va (p2 = -— Dao dpng tong hpp cua hai dao dpng c6 pha ban dau la A.-^ B.^ C.-^ D.-^ 4 12 Cau 3) Chpn phat bieu sai: A NhiJng song v6 tuyen dung de tai cac thong tin gpi la song mang B Song mang c6 tan so rat Ion so voi tan so am C Bien di§u song di^n tir la trpn song am tan voi song di^n tir tan so cao D Bien di^u song di?n tir la bien doi song am thanh song dif n tu Cau 4) Trong ong Ron-ghen (ho$c ong Cu-lit-gio), de c6 tia X, nguoi ta t^o chum electron nhanh bin vao mpt khoi chat A ran CO khoi lupng rieng Ion B rSn c6 khoi lugmg rieng nho C ran, long ho$c bat ki D c6 ap suat cao Cau 5) Chpn phat bieu sai: A Nang lupng phan h^ich toa chu yeu d d^ing dpng nang cac manh B Qua trinh phan h^ich h^t X la khong trvrc tiep ma h^t X phai qua tr^ng thai kich thich C Nang lupng toa tir 16 phan ung h^t nhan thay doi theo thoi gian D Cac san pham cua phan h^ich ^gjU la nhung h^t nhan chua nhieu natron va phong X9 P" Cau 6) Bien ap c6 cupn so cap 200 v6ng, cupn thur cap 10 v6ng ; di$n ap va cuong dp h i | u dyng a m^ch so cap la 120 V va 0,5 A Bo qua hao phi, di?n ap va cuong dp hi^u dyng cupn thur cap la A.6V;10A B 60 V ; A C 12 V ; A D 12 V ; A Cau 7) Con lie 16 xo dao dpng dieu hoa tren phuong ngang: L\rc dan hoi eye d?ii tac dyng vao v(it bing N va gia toe eye d^i cua v^t la m/s^ Khoi lupng v$t nang bang A kg B kg C kg D 0,5 kg Cau 8) Chpn y sai Nang lupng nhi?t h^ch A toa khong gay nhiem tren Trai Dat B sg la nguon nang lupng a the ki X X I tren Trai Dat C la nguon goc nang lupng cua hau het cac D eiia g heli bing nang lupng phan h^ich I g urani 160 Cau 9) Hi?n tugng nhieu anh sang A la hi?n tugng truyen sai l^ch so voi s^r truyen thSng anh sang g^p v^t can B xay ra, luon tgo hi?n tugrng giao thoa anh sang C chi xay vai chum anh sang phuc t^p, chQm sang di qua mgt 16 tron D chi xay vai chum anh sang dan sac, chum sang di qua mgt 16 tron Cau 10) Quan sat hifn tugng giao thoa tren song nuac, nguai ta dung hai ngu6n ket hgrp A, B dao dgng vai tan so f = 12 Hz va cung pha T^i diem M each hai nguon nhung khoang di = 20 cm va d: = 22 cm, song c6 bien dg cvrc d^i Giua M va duang trung tr\rc ciia AB c6 eye d^i T6c dg truyen song tren m$t nuac b^ng A 12cm/s B 8cm/s C 24 cm/s D 16cm/s Cau 11) Trong m^ch di?n xoay chieu gom RLC mac noi tiep, dg l^ch pha giira di^n ap turc thofi a hai d^u dogn m^ch va cuong dg dong di?n ti'rc thai ch^y qua m^ch khong phy thugc vao A di?n dung cua ty di^n B di?n ap hi?u dyng a hai dau do^n m^ch C dg t\ cam ciia cugn day D tan so cua dong di^n Cau 12) Dong di^n xoay chieu hinh sin c6 chu ki T, cuong dg eye d^i lb = A Vao mgt thai diem t, cuong dg tiic thai c6 gia trj i = va dang tang Sau thai diem t, mgt khoang thai gian ngin nhat la bao nhieu, cuong dg tuc thai i = A? A.I B 4I c.l D 6I Cau 13) NSng lugng ciia nguyen tu hidr6 a tr^ng thai dirng 12 dgng nSng ciia electron va the n§ng tuong A gom tac tmh di^n giira electron va h$it nhan B CO muc thap nhat thi electron chuyen dgng tren quy dao \ h^t nhan nhat C CO muc cao nhat thi nguyen tu a trying thai ben vCrng nhat D chinh la dgng nang cua electron, electron chuyen dgng tren quy d^o gan nhan nhat Cau 14) Chgn phat bieu sai: A Chi CO dong di?n xoay chieu pha mai t^o tir truong quay B Suat di^n dgng cua may phat di^n xoay chieu ti 1? vai toe dg quay cua roto C De may bien ap c6 hi^u suat Ion, nguai ta diing day c6 di^n tra suat nho lam day quan D C6ng suat di?n hao phi tren duang day tai phy thugc vao cac thiet bj di?n a nai tieu thy Cau 15) Bieu thuc di?n ap hai dau do^n m^ch chi c6 ty di?n, di?n dung C = 31,8 |iF la u = 80cos(1007it + — ) (V) Cuong dg dong di^n qua do^n m^ch la A i = 0,8>/2 cos(1007tt - ^ ) A C i = 0,8cos(100jrt- | ) A B i = 0,8cos(100nt+ — ) A D i = 0,8cos(I007it+ - ) A 161 C a u 16) K h i c6 song dirng tren rngt sgri day dan hoi t h i khoang each ba byng Hen tiep bang A mpt buac song C hai buac song B ba birac song D ntia buac song C a u 17) Trong cac hanh tinh ciia h? M ^ t Trai, hanh tinh A CO khoi lugng nho nhat la K i m tinh B CO khoi lugng Ion nhat la Tho tinh C xa M§t trai nhat la Hai V u o n g tinh D quay nhanh nhat quanh M ^ t T r a i la Hoa tinh C a u 18) Trong thi nghi^m giao thoa anh sang (khe Y-ang): DCing anh sang c6 buac song X = 0,75 \xm thi t ^ i vj t r i M tren man la van sang b^c Thay anh sang tren bang anh sang dan sac khac c6 buac song thi thay t ^ i M la van toi thur (tinh tir van trung tarn) Buac song X" bang A 0,45 ^ m B 0,6 i^m C 0,5 ^im D 0,54 ^m C a u 19) D Q cao cua am gan lien v a i A bien dp dao dpng cua am B nang lugng cua am C chu k i dao dgng ciia am D toe dp truyen song am C a u 20) Cho m^ch di?n xoay chieu RLC khong phan nhanh D i f n ap xoay chieu a hai dau m^ch on djnh Thay doi gia trj cua di?n dung C de cuang dg hi?u dyng qua m^ch Ian nhat, h? so cong suat m^ch bang ' A B C D 0,5 C a u 21) Chpn phat bieu sai: A Thien la mpt h | cac va cac dam tinh van quay quanh mpt tarn B S\ ti§n hoa ciia cac phy thupc khoi lugng ban dAu ciia chung C N h u n g c6 khoi lugng nho thi tien hoa cac chat trang D N h i j n g c6 khoi lugng Ian t h i tien hoa cac c6 nhi?t dp long rat cao C a u 22) Tren mpt dyng cy di^n c6 ghi 220 V - 500 W So ghi cho biet A dyng cy chju dugc di^n ap toi da la 220 V B dyng cy c6 cong suat tieu thy luon bang 500 W C k h i di?n ap hi^u dyng a hai dau dyng cy la 220 V t h i no tieu thy cong suat 500 W D dyng cy s6 bj hong chju di^n ap Ion han 220 V va cong suat tieu thy trung binh la 500 W C a u 23) Trong cac m o i truong rin, long, k h i va chan khong, song nao sau day truyen dugc ca moi truong? A Song ca B Song di^n tir C Song dung D Song sieu am C a u 24) Biet v^in toe anh sang chan khong c = 3.10* m/s A n h sang dan sic CO tan so 4.10''' Hz, k h i truyen chan khong se c6 buac song bang A 0,45 ^m B 0,55 ^ m C 0,75 ^ m D 0,66 )im 162 Cau 25) Chpn phat bieu sai Trong phong P, h^t nhan va h^t nhan A CO cung so khoi B khac so proton C khac so notron D c6 ciing khoi lugng Cau 26) Mpt v^t dao dpng dieu hoa tren quy d^io dai 10 cm, qua vj tri can b§ng CO toe dp 31,4 cm/s, tan so dao dpng ciia v^t la A 3,14 Hz B Hz C 15,7 Hz D 0,5 Hz Cau 27) Song di?n tir A CO toe dp Ian triiyen di?n moi chi phy thupc hSng so di?n moi B CO buac song cang dai thi kha nSng ion hoa khong cang tang C la song ngang, truyen dupe chan khong va mang n5ng lupng D ggp m^t phan each hai moi trucmg thi luon phan tra l^i Cau 28) Trong mpt phan ung h^t nhan toa n^ng lupng, d^i lupTig nao sau day ciia cac h^t sau phan irng Ion hon so vai lue truae phan irng? A Tong vecta dpng lupng cua cac h^t B Tong so nuelon ciia cac hat C Tong dp hyt khoi cua cac h^t D Tong khoi lupng ciia cac h^t Cau 29) D^t di?n ap xoay chieu (eo di?n ap hi?u d\ing bang 100 V ) vao hai dau do^n m^ch RLC noi tiep Biet cam khang ZL = 200 Q, dung khang Zc = 100 Q, cong suat tieu th\ ciia do^n m^ch P = 40 W Nhu v^y: A R = 50Q B R = 0 Q C R = Q D R = 250 Q Cau 30) Chpn y sai Theo li thuyet Anh -xtanh, mpt v$t co khoi lupng A thi cung eo n^ng lupng tuong ung va ngupc l^i B tang len (so vai khoi lupng nghi) v^t chuyen dpng vai toe dp v C CO dpng nang bang hi^u nang lupng toan phan vai nang lupng nghi ciia no D nghi khac mai c6 khoi lupng tuong doi tinh khac Cau 31) Song v6 tuyen, tia hong ngo^i, anh sang nhin thay, tia tit ngo^i, tia X va tia gamma deu A lam phat quang mpt so chat B lam Ion hoa khong C CO buc xa cua MJt Trai D c6 tinh hat va tinh song nhu Cau 32) Do^n m^ch xoay chieu gom t^i C va di?n tra R = 100 x/3 Q mkc noi tiep Biet difn ap hai dau m^ch l^ch pha 60° so vai di^n ap hai dau ty C Dung khang ciia ty bang A 300 Q B 100— Q C 100 D.100 Q II Phan rieng: A Theo chirong trinh chuan: (8 cau, tir cau 33 den cau 40) Cau 33) D^i lupng d^c trung cho tinh chat ddi chieu nhanh hay ch^m ciia mpt dao dpng dieu hoa la A bien dp B v^in toe C gia toe D tan so 163 C a u 34) Chpn phat bieu diing : A M p i chat rkn, long va k h i nung nong a nhi?t d p cao deu phat sang B Quang anh sang cua mpi chat nung nong phat ra, gpi la quang lien t^jc C Chieu chijm anh sang tr4ng qua chat ran, long, ta thu dupe quang v^ch hap thy D Quang vach hap thy la nh&ng vgch toi C a u 35) Trong phong A Cling tren nen sang trang a, tia phong ban chat v a i tia X B di dupe khong k h i chirng vai cm C CO the di qua lap k i m lo^ii day vai c m D CO toe d p gan bang toe d p anh sang C a u 36) Dung thuyet lupng tir anh sang s e khong giai thich dupe A t h i nghi?m Hecxa ve quang di?n B hi?n tupng phat quang cua mpt s o chat C quang v^eh phat x^ cua Hidro D t h i nghi?m Y-ang v e giao thoa anh sang C a u 37) M^eh dao dpng gom cupn day e o d p t y cam L , di?n tra thuan R = 0, di?n CO di^n dung C = nF Tich di^n cho ty hi?u difn the V , sau d o cho phong di^n qua cupn day Nang lupng tir truong m^ch hi?u di^n the tren ty la V A bang 3.10*J B bang6.10"J C bang 1,5.10"*J D bang 12.10"'J C a u 38) A n h sang don sic t i m c6 buac song X bang A 0,4 m m B 0,4 ^im C 0,4 n m D 0,4 pm C a u 39) Do^n m^ch A B gom b a do^n m^ch A M , M N v a N B noi tiep Do^n m^ch AM c h i CO c u p n day thuan cam c6 cam L = — H , d o ^ n m^ch M N chi co dp t y n 10-^ di§n tra thuan R, do^n m^ch N B chi c6 ty di^n c6 di?n dung C = ^ - ^ ^ — F Dat; mpt d i f n apu^^fj = 120V2sin lOOnt ( V ) vao hai dau do^n m^ch A B De u^;.^ va U f ^ ^ y u o n g pha, gia trj ciia bien tra bang 12Cv^n A B I O V Q C 80V2 Q D 60>/2Q C a u 40) N h o m cac nuclon va hireron, gpi la A mezon B barion C lepton D pion B Theo chuong trinh nang cao: (8 cau, tir cau 41 den cau 48) C a u 41) Song di?n tir va song am A deu CO toe dp Ian truyen phy thupc vao moi truong B di tir khong k h i vao nuac thi buac song tang C deu bj l?ch di^n truong m^nh D deu dya vao sy bien d^ng moi truong truyen d i 164 Cau 42) Phat bieu nao sau day la diing noi ve quang pho? A Quang lien tyc ciia nguon sang nao thi phy thupc phan cau tao ciia nguon sang ay B M o i nguyen to hoa hpc a tr^ng thai hay hai nong sang d u a i ap suk thap cho mgt quang v^ch rieng, d$c trung cho nguyen t6 C De thu dirgfc quang hap thy thi nhi?t dp ciia dam k h i hay hai hap thy phai cao hom nhi?t dp cua nguon sang phat quang lien tyc D Quang hap thy la quang ciia anh sang mpt v^t rin phat v^t dupe nung nong Cau 43) Trong thi nghi?m giao thoa anh sang Y- ang: khoang each hai khe S1S2 la mm, khoang each tir S1S2 den man la m ; nguai ta diing anh sang trSng buac song bien doi tir 0,38 |im den 0,76 j i m Tai M each van trung tam m m c6 may birc X ? cho van sang? A B C.4 D Cau 44) Mpt v^t rkn dang quay nhanh dan deu quanh mpt trye c6 djnh xuyen qua vat Mpt diem tren v^t ran khong niim tren trye quay c6 A dp Ian ciia gia toe tiep tuyen luon Ian han dp lorn ciia gia toe huong tam B gia toe tiep tuyen huong vao tam quy dgo C gia toe tiep tuyen tang dan, gia toe huong tam giam dan D gia toe tiep tuyen eiing chieu vai chieu quay cua v^t ran a moi thai diem Cau 45) Momen dpng lupng cua mpt v^t quay quanh mpt trye c6 djnh dupe xac djnh bai: L = 2t + (SI) Momen lye tac dyng len vgt vao thai diem t = s bang A.3Nm Cau 46) H^t nhan B N m C N m sau phong x? bien h^t 2+1Y A a B, p- D N m Day la phong x? C.y D ;au 47) M p t momen lyre c6 dp Ian 30 N m tac dyng vao mpt banh xe c6 momen quan tinh doi vai trye banh xe la k g m l Neu banh xe quay nhanh dan d^u tir tr^ng thai nghi thi sau giay toe dp goe cua banh xe la: A15rad/s B 20 rad/s C 7,5 rad/s D 30 rad/s Cau 48) Cho m^ch xoay chieu A B theo thir t y gom cupn day khong thuan cam, ty di?n va di?n trd thuan noi tiep Gpi N la diem noi giCra ty di?n va di?n tra Biet di?n ap hai dau m?ich sam pha goe (p > so vai di?n ap hai dau A va N M?ch A CO tinh cam khang B c6 cpng huong C UMN ch§m pha so v a i UAB goe — - D CO tinh dung khang 165 HirdNG D A N G I A I Cau 1) B X = 5cos(20t - — ) cm Toe v^t CO li dO X = cm: |v| = ( o V A ^ - x ^ = 60 cm/s Cau 2) D (Pi = - v a ( | ) = - - ; A, = A2 _, ^ A,sincp, + Ajsintpj sincp,+sin(p2 x^t.^ • Tu tan(p = — — — = — - — ^ => Ket qua Ajcoscp] + A2COSCP2 cos(pi+cos92 Cau3)D Cau 4) A Trong ong Rom-ghen (ho$c ong Cu-lit-gia), de c6 tia X, nguai ta t^o chum electron nhanh ban vao mpt khoi chat rSn c6 khoi lugng rieng Ian Cau 5) C Nang lugrng toa tir 16 phan umg h^t nhan khong thay doi theo thai gian => C sai Cau 6) A N , = 200 vong, N2 = 10 vong; U, = 120 V va I , = 0,5 A -r- ^ N Tu U, — - N, =iL = ^ K Q I2 Cau 7) A Con l§c 16 xo dao dgng di^u hoa tren phuang ngang: = mco^A = (1) Fdhmax a„ax = co^A = (2) T i r ( l ) & ( ) = > m = kg Cau 8) D Cau 9) A Hi^n tugng nhieu x? anh sang la hi?n tugmg truyen sai l^ch so vai s\ truyen thing anh sang gjp v^t can Cau 10) A f = 12 Hz ; di = 20 cm va d2 = 22 cm M c6 t i e n dp eye d^i, giua M va duang trung tr\rc cua AB eo cvrc d^i => M nam tren duong eye dgi b^c T a e : d - d , = 2?i = 2=>X,= cm=:>v = ?.f= 12 cm/s Cau 11) B D p l^ch pha giua di?n ap tuc thai a hai dau d o ^ m^ch va cuang dp dong di^n tuc thai ch^y qua m^ch khong phy thupc vao dif n ap hif u d^ng a hai dau do^n m^ch Cau 12) C lo = A Tgi thai diem t: i = va dang tang T Cuang dp tuc thai i = A = 0,5Io sau thai gian At - — (Tmmg tu tim thai gian vgt di tir lidQX = den x = 0,5A dao dqng dieu hoa) 166 Cau ) A Nang lugng cua nguyen t u hidro a tr^ng thai dung gom dpng nang ciia electron va the n5ng tuong tac tTnh di^n giua electron va h^t nhan Nang lugng ctia nguyen t u hidro c6 muc thap nhat thi electron chuyen dpng tren quy d^o gan h^t nhan nhat NSng lugng ciia nguyen t u hidro c6 mirc cao nhat thi nguyen t u d tr^ng thai kem ben vung nhat Cau 14) A Khong chi c6 dong di^n xoay chieu pha mai t^o t u trucmg quay Cau 15) B Cuong dp dong di?n qua do^in m^ich chi c6 ty di^n nhanh pha ^ dau m?ich => i = 0,8cos( OOm + ^ ) so v a i u hai A Cau 16) A Khi CO song dung tren nipt spi day dan hoi thi khoang each ba byng lien tiep bang mpt buac song Cau 17) C Trong cac hanh tinh ciia h | M§t T r o i , hanh tinh + CO khoi lupng nho nhat la Thuy tinh + CO khoi lupng lorn nhat la Mpc tinh + xa M$t Troi nhk la Hai V u c n g tinh + quay nhanh nhat quanh M$t Troi la Thuy tinh Cau 18) C Khi anh sang c6 budc song k = 0,75 |am: X M = 5i = — (1) a X.'D Khi anh sang c6 buac song X ' : X M = 7,5i = 7,5 (2) a T i r ( l ) & ( ) = > r = 0,5 urn Cau 19) C Dp cao cua am gSn lien v o i chu k i dao dpng cua am Cau 20) C Ciiu21)D Nhung c6 khoi lupng Ion thi tien hoa cac c6 nhi^t dp long giam dan Cau 22) C Tren mpt dyng cy di?n c6 ghi 220 V - 500 W So ghi cho biet di?n ap hi?u dyng a hai dau dyng cy la 220 V thi no tieu thy cong suat 500 W Cau 23) B Cau 24) C X = - = 0,75 urn 167 Cau 25) D Trong phong x^i p, h^it nhan va h^t nhan m? c6 cung so khdi nhimg khong c6 ciing khoi lirgng Cau 26) B 2A = 10 cm => A = cm Tir Vn,ax = (oA = 27tfA = 31,4 => f = Hz Cau 27) C Song di$n tu la song ngang, truy^n dugc chan khong va mang nSng lugng Cau 28) C Trong mpt phan umg hat nhan toa nang lugng, tong dp hyt khoi cua cac hat sau phan ung Ion hon so vai liic truac phan iJrng Cau 29) A Tir P = RI^ ^ o R = 50Q R + ( Z L - Z C ) ' Cau 30) D Theo li thuyet Anh -xtanh, photon c6 khoi lupng nghi bang nhung van c6 khoi lupng tuong doi tinh khac Cau 31) C Song v6 tuyen, tia hong ngoai, anh sang nhin thay, tia tCr ngoai, tia X va tia gamma deu c6 birc xa ciia Mat Trai Cau 32) D R = IOOV'3 Q Tir tan cp - - V3 =^ Zc = 100 Q R Cau 33) D D^i lupng d?ic truiig cho tinh chat doi chieu nhanh hay ch^m cua mpt dao dpng dieu hoa la tan so Cau 34) A Cau 35) B Cau 36) D Dung thuyet lugng tir anh sang se khong giai thich dupe thi nghi^m Y-ang ve giao thoa anh sang Cau 37) A - C = 5nF=5.10-'F;Uo = V NSng lupng tir trucmg m^ch u = V : W, = W - W a = ^ - ^ = 3.10-"] Cau 38) B Cau 39) B U A B =120V2sinl00Ttt ( V ) L = - H =>ZL = 0 Q ; C = ^ F : ^ Z c = lOOfi 71 7t z ~z — ^ = ^ - => R = 100\^Q u^N va u^iB vuongpha ^ tancp^N-t^^MU R 168 R Cau 40) B Nhom cac nuclon va hiperon, gpi la barion Cau 41) A Song di^n tir va song am deu c6 toe dp Ian truyen phy thupc vao moi trircmg Cau 42) B Cau 43) A a = mm, D = m; buac song bien doi tir 0,38 ^m den 0,76 ^m Tji M CO XM = mm la van sang khi: ^ a kD 4k k Vori k = 2, => X = 0,75 jim va X= 0,5 ^m Cau 44) D Mpt v^t tin dang quay nhanh dan deu quanh mpt tryc c6 djnh xuyen qua v^t Mpt diem tren v^t ran khong n5m tren tryc quay eo gia toe tiep tuyen cung chieu vai chieu quay cua rSn a moi thai diem Cau 45) C Momen dpng lugmg cua mpt v^t: L = 2t + (SI) ^ M = — = 2Nm dt Cau 46) B H9t nhan ^ X -> ^fiY + -1e => Day la phong \ p" Cau 47) D Cau 48) D ON LUYEN TU TAI 1, Phan chung cho tat ca cac thi sinh: (32 cau, tir cau I den cau 32) Cau 1) Mpt v^t thyc hi?n dong thai hai dao dpng dieu hoa ciing phuoTig, cung tan s6:x, =4cos(7tt+ cp) (cm) va X =4^f3s\nnt (cm) Bien dp dao dpng tong hpp d?t gia trj nho nhat A ( t ) = - ^ B (j) = C (( = 7t D < t ) = - K Cau 2) Lye h^t nhan A CO cung ban chat vai lyc hap dan va lyc tmh di^n B chi tac dyng ph^im vi kich thuac nguyen tir C phy thupc khoi lupng va di^n tich cac hat lien ket D la lo^i lyc truyen tuang tac giira cac nuclon h^t nhan Cau 3) Thyc hi?n giao thoa anh sang vai hai khe Y-ang each 0,8 mm Nguai ta dupe tren man be dai khoang van la 7,2 mm Neu cho man di ehuyen xa hai khe them 50 em thi dupe be dai khoang van lien tiep la 8,4 mm Buac song cua anh sang la A 0,56 urn B 0,64 urn C 0,5 urn D 0,72 urn 169 Cau 11: Chpn cau phat bieu sai noi ve song am A Am cac nh^c cy phat c6 tan so ciia am ca ban B Nh^c am la nhCrng am c6 tan so xac djnh C Am nghe dupe c6 tan so tir 16 Hz den 20 kHz D Nguong nghe hau nhu khong phy thupc vao tan so Cau 12: Chpn cau sai noi ve may bien ap A May bien ap a che dp khong tai (hai dau cupn thur cap de ha) thi no hau nhu khong tieu thy di^n nSng B Trong kT thu^t han di^n, nguai ta su dyng may bien ap c6 so vong cupn so cap Ion han so vong cupn thur cap C Tir thong qua hai cupn so cap va thu cap la nhu D May tSng ap se lam giam cuong dp dong di^n Cau 13: Chpn phat bieu dung: A Cong suat hao phi tren duang day tai dif n ti 1? vai cong suat can truyen tai B Chi do^n m^ch di?n xoay chieu c6 di^n tra R thi dong di^n mai cung tan so vai di?n ap hai dau do^m m^ch C Khi CO cpng huang do^n m^ich di^n xoay chieu RLC mic noi tiep thi di?n ap giua hai dau do^n m^ch dat gia trj eye d^i D Trong may phat di?n xoay chieu ba pha luon c6 roto la phan cam, stato la phan irng Cau 14: D^t mpt difn ap xoay chieu u = 200 V2 coslOOnt ( V ) vao hai dau do^n m^ich gom bien tra, cupn cam thuan va ty di^n mac noi tiep Thay doi bien tra den cac gia trj Ri = 75 Q va R2 = 125 Q thi cong suat P cua dong di^n m^ich AB CO gia trj nhu la A.400W B.200W Cau 15: Mpt do^n m^ich di?n xoay chieu nhu hinh vg Khi k dong, dong difn qua m^ch ch$m pha han di^n ap hai dau m^ch la — Khi k ma, dong di?n C lOOW D 50 W R B qua m^ch ch|m pha han di^n ap hai dau m^ch la — Biet X chi chua mpt ba phan tu: di?n tra thuan R, cupn day thuan cam L, ty di?n C X la A R B L C C D Khong the ket lu^n dupe Cau 16: Mpt do^n m^ch gom di?n tra thuan R = 100 Q, ty di^n C , cupn cam thuan L mic noi tiep D$t vao hai dau m^ch mpt di^n ap xoay chieu c6 tan so 50 Hz 6n djnh thi UR = U L = Uc va m^ch tieu thy cong suat 200 W Thay ty C bang ty C thi cong suat tieu thy ciia mgch bSng 50 W Gia trj C hkng bao nhieu? A 11,65 ^iF B.31,8HF C 22,5 )aF D 15,9^F 31S Cau 17: Mpt bong den day toe dugrc mSc vao m^ng difn khong doi U = 220 V thi thay den sang binh thuong Khi mSc vao m^ng di$n xoay chieu c6 d i | n ap c\rc d^ii Uo thi den cung sang binh thuong Uo c6 gia trj la A I I O V V B.220V2V C l l O V D.220V Cau 18: Dpng co khong ddng bp pha c6 A toe dp quay cua roto c6 the ion hon toe dp quay cua tir tnrong B chieu quay cua roto khong thay doi dupe C nguyen tac ho^t dpng d\ra tren hif n tupng t\ cam D cong suat tieu thy bang tong cong suat tieu thy a cupn day Cau 19: M^ch di^n xoay chieu RLC (R ^ 0) mic noi tiep c o c o L — J - = R Neu coC giam tan so dong difn va giu cac thong so khac khong doi thi hf so cong suSt ciia m^ch A tang roi giam B luon khong doi C luon giam D luon tang Cau 20: Mpt do?in m?ich difn xoay chieu RLC noi tiep (cupn day thuan cam) D^t vao hai dau m^ch mpt di^n ap xoay chieu u = 100 V2 cos(1007tt ~ ) CV)- Biet R = 50 Q , ZL - Zc = -j^, bieu thuc cua dong di?n qua m^ich la A i = V3cos(1007rt+ y ) A B i = V6cos(1007rt+ y ) A C i = N/^cos(1007rt+ - ) A D i = N/6 cos(1007rt + - ) A 6 Cau 21: Phat bieu nao sau day la diing? A Song difn tu c6 the la song ngang ho^c song dpc B Song di^n tu chi Ian truyen moi truong v^it chat C V?in toe song di^n tu bang 3.10* m/s, khong phy thupc vao moi truong D Song di^n tu luon la song ngang va Ian truyen dupe ca chan khong Cau 22: M^ch dao dpng difn tir gom cupn day thuin cam L = 50 mH va ty di?n C = 50->iF Biet gia trj eye d^i cua di^n ap giOa hai dau ty difn la 12 V T^i thai diem di?n ap gifta hai dau cupn day bang V thi nang lupng di?n truong va nang lupng tir truong Ian lupt la A 2.10"^ J va 1,6.10^ J B 1,6.10-^ J va 2.10"* J C 2,5.10-' J va 1,1.lO-" J D 0,6.10-' J va 3.10-" J Cau 23: Chpn phat bieu dung: A NhiJng song di^n tu c6 tan so lom hon 30 MHz c6 the xuyen qua tang difn li cua quyen B Khi song dif n tu truyen di no mang theo cac phan tu v$t chat cua moi truong C Song dif n tir c6 cung ban chat voi song ca hpc D Cuong dp difn truong xoay cang yeu toe dp bien thien cua tir truong cang nhanh 316 Cau 24: M?ich song LC ciia radio c6 L = 0,1 H De bit dugrc song cua dai phat TPHCM (tan so 99,9 MHz) thi phai dieu chinh ty C c6 gia trj bSng bao nhieu? A 50,35 B.31,8^F C 15,9 nF D 63,6 ^iF Cau 25: Chpn phat bieu sai: A M6i anh sang dorn sic c6 mpt buac song chan Idiong xac djnh B Anh sang m^t trai la hon hgrp cua v6 so anh sang dan sic bien thien lien tyc C Cac anh sang c6 buac song tu 0,2 den 1,2 mai gay cam giac sang a mat D De xay hifn tugrng giao thoa anh sang thi hai song anh sang phai dugrc phat tu hai nguon ket hgp Cau 26: Trong th\rc te, de sSy kho suai am nguai ta dung buc x^ c6-buac song, khoang A 0,76 ^m den vai mm B 0,38 fxm den vai nm C 10"* m den lO"" m D nho hon lO"*" m Cau 27: Chpn phat hiku sai: A Cac tr^ng thai diJmg cua nguyen tu ung vai qui d^o c6 ban kinh hoan toan xac dinh B Thai gian song cua cac nguyen tu cac tr^g thai kich thich c6 the keo dai den vai chyc giay C Buac song anh sang kich thich nho hon bu6c song anh sang phat quang D Hif n tugfng Ian quang thuang xay vai chat r5n Cau 28: De buac song cua anh sang, nguai ta tien hanh thi nghif m giao thoa anh sang vai khe Young Chieu sang hai khe bang nguon laze c6 buac song X Biet khoang each giOa hai khe la 0,5 mm, khoang each tu hai khe den man la m va tren man quan sat, khoang each giua van sang lien tiep dupe la mm Buac song X bSng A 0,5 urn B 0,75^m C 0,6 nm D 0,4 ^im Cau 29: Nguai ta d$t gitta anot va catot cua ong Cu - lit - gia mpt hi?u dif n the Ui thi buac song ngSn nhat ciia tia X phat la 0,2 |jjn Neu d^t vao giiia anot va catot mpt hi?u di^n the U: = 2Ui thi buac song ngin nhat cua tia X phat bSng bao nhieu? A 0,2 ^m B 0,1 nm C 0,05 ^m ^ D 0,75 ^im Cau 30: Phat bieu nao sau day khong thupc npi dung cua thuyet lupng tu anh sang (thuyet photon)? A Anh sang dupe t^o bai cac h^t gpi la photon B Vai anh sang c6 tan s6 f thi m6i photon mang nSng lupng bing hf C Trong chan khong, photon bay vdi toe dp c = 3.10* m/s D Electron sS b$t khoi kim lo^i neu dupe chieu sang thich hpp 317 Cau 31: Chi^u vao tam kim loai m9t buc thi xay hi^n tugng quang difn Khi giam buac song va tang cuong dp chum buc x^ thi A v^n toe c\rc d^i ciia electron quang di?n giam B so electron quang di^n b$t khoi catot mpt giay tSng C so electron quang di^n b^t khoi catot mpt giay giam D v^n toe cvre d^ii cua elecron quang di?n khong doi Cau 32: Nguyen tac ho^t dpng cua laze la dvra vao hi^n tugng A quang di?n B quang di^n ngoai C phat X? ty phat D phat x^ cam ung Cau 33: Kich thich dam nguyen tiJr hidro tijr tr^ng thai ca ban bang vife cho hap thy photon CO nSng lugng thich hgp Biet so v^ch phat la Ban kTnh quT d^o ung vai trying thai kich thich bSng A 5,3.10-" m B 4,77.10-'°m C 1,59 10"'° m D 8,48 10'° m Cau 34: Chpn phat bieu sai: A H^t nhan nguyen tu dugc cau t^io tu cac nuelon B Khoi lugng nguyen tir t^p trung gan nhu toan bg a h^t nhan C Kich thuae h^t nhan ti 1? vai binh phuong so khoi D Dong vj la nhirng h^t nhan ciing so proton khac so natron Cau 35: Mgt phan ung h^t nhan toa nSng lugng X] + ^2 Y+n Biet nSng lugng lien ket cua cac h^t nhan X i , X2 va Y Ian lugt la a, b va c NSng lirgng toa cua phan ung la A a + b + e B a + b - c C.c-b-a D a + c - b Cau 36: Dong vj ^ C o la chat phong x? vai chu ky ban T = 5,33 n5m, ban dau mgt lugng Co c6 khoi lugng nio Sau mgt nam lugng Co tren bj phan r5 bao nhieu phan tram ? A 12,2% B 87,8% C 30,2% Cau 37: Trong qua trinh bien doi h^t nhan, h^t nhan D 42,7% chuyen h^it nhan ^92 U sau da phong mgt h^t a va hai A proton B natron C electron D pozitron Cau 38: Tim phat bieu sai So vai phan ung phan h^ch thi phan ung nhift h^ch A toa nang lugng Ion han (neu tinh tren mgt dan vj khoi lugng nguyen lifu) B CO nguon nhien lif u rat nhieu tren Trai Dat C de kiem soat hon phan ung phan h^ch vi khong c6 phan ung day chuyen D khong gay nhiem moi truang nhu phan ung phan h^ich Cau 39: Tuang tac di^n tir A la tuang tac giila cac h^t mang di^n va khong c6 khoi lugng B CO cuong dg l\rc tuang tac rat Ion so vai tuang tac hap dan C luon xay doi vai cac h^t sa cap D chi xay cac h^t a h^t nhan nguyen tij 318 Cau 40: D phong xa ban dau ciia nguon phong xa chua No hat la HQ Khi dp phong x^ giam xuong 0,25%Ho thi so h^it nhan da bj phong x? la 4 II Phan rieng A Danh cho thi sinh h(fc chvong trinh chuan (tu* cau 41 den cau 50) Cau 41: Khi noi ve dao dpng di^u hoa cua mpt v$t, khSng djnh nao sau day la sai? A L\rc hoi phyc luon trai dau voi li dp B Chu ki la khoang thai gian giu-a hai Ian lien tiep li dp va v^n toe l$p l^ii gia trj nhu cu C The nang va ii dp cua v$t bien thien ciing tan so * D Trong mpt chu ki v$t di dupe quang duong bang Ian bien dp Cau 42: Chpn y sai Mpt vgt dao dpng dieu hoa vai phuong trinh x = Aeos(©t + (p ), d?ii lupng A CO gpi la tan so goc ciia dao dpng B A gpi la bien dp dao dpng C (p phy thupe vao cac kich thich ban dau D A khong phy thupe kich thich ban dAu Cau 43: Mpt nhung d$c trung sinh li ciia am la A tan so B am sic C muc cuong dp D cuong dp Cau 44: Cho m^ch di?n xoay chieu L nhu hinh ve Biet eupn day c6 di?n R nooooor\ tra khong dang ke Khi khoa k A—CD—' dong dong di^n qua m^eh ch^m pha han di?n ap hai dau m^ch la OOOOuO^ C ^ B — Khi khoa k ma dong di^n qua m^ch nhanh pha han di^n ap hai dau m^ch la — Moi lien h? giua cam khang ZL va dung khang Zc ciia m^ch la A Z L = ( V + l)Zc B Z L = 2ZC C-Zi=-^ D.ZL-(V3-1)ZC Cau 45: Chpn y sai Thuyet lupng tu anh sang c6 the giai thich dupe hi?n tupng A quang di?n B quang dif n ngoai C quang - phat quang D nhilu x? anh sang Cau 46: D$t mpt difn ap xoay chieu, c6 gia trj hi?u dyng 220 V vao hai dau d o ^ m^ch m3c noi tiep gom di^n tra thuan 50 Q, eupn cam thuan va ty difn c6 difn dung thay doi dupe Dieu chinh ty C de difn ap hifu dyng giiJa hai dau eupn cam thuan d^t eye d^i Khi do, cong suat tieu thy cua m^eh b3ng bao nhieu? A 968 W B 1000 W C 500 W D 200 W 319 Cau 47: Chpn phat bieu dung: A MJt Trcri dugrc cau t^io gom hai phan la s5c cau va nh§t hoa B HSng so M$t Troi la nSng lugmg cua no truyen vuong goc tai mpt dom vj di?n tich each no mpt ion vj thien vSn C Cac hanh tinh quay quanh M§t Trai theo cung mpt chieu D M$t Troi dugrc cau t^o gom hai phan la quang cau va quang quyen Cau 48: Xet lie don treo tren mpt thang may Chu ki lie tSng len thang may chuyen dpng A deu len tren B nhanh dan deu len tren vai gia toe a < g C rod t\ D ch$m dan deu deu len tren vai gia toe | a I < g Cau 49: Trong s\ phat quang, thai gian phat quang A la khoang thcri gian tir luc ngung kich thich den luc ngung phat quang B la khoang thai gian tir liic hit dau kich thich den liic ngimg phat quang C la khoang thai gian tCr liic bat dau kich thich den liic ngimg kich thich D luon giong doi vai mpi chat phat quang Cau 50: Mpt chat phong ban dau c6 No nguyen tu Sau ba chu ki ban rS, so h^it nhan l^ii la A.N=^ B N = ^ C.N=^ D.N = 3No B Danh cho thi sinh h9c chmnig trinh nang cao (tur cau 51 den cau 60): Cau 51: Mpt chat diem chuyen dpng tren duong tron c6 ban kinh 30 cm, gia toe goc la 1,5 rad/s^ va chju tac d\ing cua momen l\rc 0,018 Nm Khoi lugmg v^t bang A 133g B.200g C.40g D lOOg Cau 52:-DTa cua mgt xe d^p c6 ban kinh gap hai Ian ban kinh cua lip Ban kinh banh xe la 31,85 cm Mgt nguai di xe v6i toe dg m/s thi phai d^p xe vol toe dg quay A 150 vdng/phiit B 300 vong/phut C 75 v6ng/phut D 50 vong/phiit Cau 53: Ggi lo la cucmg dg chum anh sang t6i moi tnrang;a la h§ so hap thy cua moi truomg; d la dg dai cua duong di tia sdng Cucmg dg I cua chiim anh sang dom sic truyen qua moi truong hap thy A I = Ioe'ad -iod B I = Ioe^ C I = Ioe -ad D I = I(,ae 320 Cau 54: Cho m^ch di?n xoay chieu RLC noi tiep: Biet L = - H ; C = ^'^^ F Difn ap xoay chieu hai dau m^ch u = U^cos(2nft—^) Thay doi tan so f, di^n ap giiia hai ban ty di?n l^ch pha ^ so vai u thi f c6 gia trj bang A 60 Hz B 72Hz C 50 Hz D 120 Hz Cau 55: Tieng coi c6 tan so 2500 Hz phat tir mpt dau tau xe lua dang chuyen dpng xa nguai quan sat vai toe dp 36 km/h, toe dp am truyen khong la 340 m/s Liie tai nguai quan sat nghe dupe am c6 tan so A 2428,6 Hz B 2345,8 Hz C 2456,8 Hz D 2312,9 Hz Cau 56: Dp phong x^ cua ^^C mpt tupng go bang 0,65 Ian dp phong x^ cua g'^C mpt khuc go ciing lo^i cung khoi lupng vua mai ch^t Chu ki ban ciia 6*C la 5700 nam Tuoi cua tupng go la A 3521 nam B 4352 nam C 3542 nam D 3452 nam Cau 57: H^it sa cap ben la A proton B omega C cac mezon D cac hadron Cau 58: Mau sac cua v^t A ehi phy thupc mau sac cua anh sang chieu vao no B chi phy thupc v$t lif u cau t^o v^t C khong phy thupc mau sac cua anh sang chieu vao no D phy thupc v^t li^u cau t^o v$t va mau sac cua anh sang chieu vao no Cau 59: Mpt nguai quan sat mpt ehiee phao tren m^t bien thay no nho len cao 10 Ian 18 s, va thay khoang each hai ngpn song ke la m Toe dp truyen song bien la A m/s B m/s C m/s D m/s Cau 60: Do^n m^ieh difn xoay chieu gom ^ ^ eupn day CO di^n tror ho^t dpng Ro = 50 ^ B WUVVUU w Q, dp ty cam L = — H va ty di^n -'UMMIT^ 271 mac noi tiep Dong di?n qua m^ich c6 tan so 50 Hz Biet di^n ap giua hai dau cupn day vuong pha vai di^n ap giiia hai dau m^eh Dif n dung eua ty c6 gia trj bang bao nhieu? n In % Hir6NG DAN G I A I 2n Caul:B Dya vao thj ta c6: Gia toe eye la a^ax = m/s^; bien dp dao dpng A = 0,05 m TCrcongthuc a^x = w^A :::>(o = 10rad/s 321 Cau 2: C Cau3:A Dp dan ciia 16 xo h^ v$t M va m a vj tri can bSng la A L = ^ ^ i ± ^ = 0,06 m k Khi cat day noi giua v|t m va M thi v^t M dao dpng dieu h6a vai: Me 0,4.10 + Bien dp la A = AL - —^ = 0,06 = 0,02 m + Chu ki la T = 27t M k= 0,4 s 100 Khi do, v$t m se rai ty tu dp cao h => thai gian v^t m ch^m dat la t== 2h = s U =:> So chu ki ma v^t M th\rc hi?n dupe m ch^m dat la n = At — = 2,5 T => Quang duong v$t M di dupe la As = lOA = 0,2 m = 20 cm Cau 4: C Khi toe dp cua v$t d?it c\rc d^i thi l\rc dan hoi bang => v^t qua vj tri can b5ng 16 xo khong bien d ^ g => lie khong the dao dpng theo phuong thSng dung, cau 5: B Khi l\rc hoi phyc bang thi v$t qua vj tri can blng => chieu dai cua 16 xo a vj tri can bang la Ice = 25 cm Khi Ivrc dan hoi bang thi 16 xo c6 chilu dai t\ nhien lo = 20 cm => dp bien d ^ g cua 16 xo a vj tri can bang la Al = cm : ^ c o ^ = A = _10_=200 Al 0,05 Cau 6: D Bien dp cua hai dao dpng Ai = A2 = — CO Ma hai dao dpng vuong pha =>Bien dp tong hpp tong hpp la A = A,V2=-^/2 CO Cfiu 7: C Binh phuomg tan so g6c cua dao dpng Ik co^ = j = 12,5 mco^S'^ Tu cong thijc tinh nang lupng dao dpng cua lac la E = —^—^ So = 1,6 cm Cau 8: D 322 Cau 9: D Theo phuong trinh truyen song => 0,47tx = 2n\ oX = 5m Tan so cua song la f = 3,5 Hz => toe dp truyen song v = Cau 10: A Buac song X, = vT = cm Theo de bai ta c6 M A = 27 cm va M B = 23 cm = : > M A - M B = 4cm = 2? M thuQC eve d^i b^c Cau 11: D Cau 12: C Tir thong qua hai cupn day ti 1? vai so vong cua no Cau 13: D Cau 14: B Theo de bai ta c6: (ZL - Zcf = R1.R2 cong suat tieu thy cua m?ich la Pi = P2 = Ril^ = 17,5 m/s = Ri Rf+(ZL-Zcr = 200 W R1+R2 Cau 15: C Khi k dong m^ch gom R va C noi tiep Khi k mo m^ch gom R, X va C noi tiep Vi dp l|ch pha cua u va i tSng len => X la ty dif n C Cau 16: A Ban dau, U L = Uc nen m?ich xay hi?n tugng cpng huong => cong suat tieu thy cua m^ch eye d^i la Pmax ^ -zr 200 W (1) R Khi thay ty C bSng ty C thi cong suat tieu thy cua m^ch la P= R cos\ 500 W (2) T i r ( l ) v a ( ) = > cos^9 = 1/4 ^ R^ R2+(ZL-Z'C) M$t khac, ta CO U L = UR => ZL = R = 100 Q (ã*) (*) va (**)=> Zc ô 273 Q C= = 11,65 ^F CoZr 323 Caul7:B Cau 20: B Cau 18: D Cau 19: A Tong tracuam^ch l a Z = ^JvJT(Z^~-Z^ = ^ Q cuong dp dong di?n c\rc d^i la lo = — = yJZ A tan9 = ——— R = ^ = > ( p = - z : > u nhanh pha hon i la — N/3 ^ => bieu thuc cua dong d i | n la i = V6 cos(1007rt + ^ )A Cau 21: D Cau 22: B Theo de bai, di^n ap giua hai ban t\ la u = V = —UQ => nSng lugrng di$n truong la W d = ^ W = ^ ^ C U o = 1,6.10"^J => nSng lugmg tir truong Wt = W Cau 23: A Cau 24: A = 2.10"^ J Tan so song ma m^ch thu dugrc la f = 271 V L C di$n dyng cua ty la C = = 50,35 Cau 25: C Cau 26: A De say kho, suai am nguai ta diing tia h6ng ngo^i Cau 27: B Cau 28: A Khoang each giua van sang lien tiep la 2i = mm (vai i la khoangt van) => i = mm Ap dyng cong thue i = — a =:>X = — = 0,5 |im D Cau 29: B Tac6:e.U, = - i l i - va hir^ = ^ ,.U,=-^=> '^Imin ^2min ^Imin *-'2 = L=^x,^^ = 0,l ^ Cau 30: D Cau 31: B Cau 32: D Cau 33: B Do so v^ich phat la nen nguyen tu a muc nSng lugrng thu (n = 3) Theo cong thuc: r = ro.n^ = 4,47.10''" m Cau 34: C Cau 35: C 324 Cau 36: A Kh6i lugrng Co bj phan sau mpt nSm la Am = mo( 2" Vaik=l= T ' 5,33 :=> Am = 0,122mo Cau 37: C khoi lirgrng Co bj phan rS 12,2% 92^U->^i^U+^a + 2^X Ap dyng djnh lu|lt bao toan so khoi va bao toan di^n tich ta dugrc 238 = 234 + + 2A 92 = 92 + + 2Z =>A = OvaZ = - l =>X: °,e Cau 38: C Cau 39: B Cau 40: B Ta CO Ho = XNo; H = XN ( N : so h^t nhan l?ii) H N = 4=>N = So h^it nhan da bj phong _ 3No la AN = Cau 43: B Cau 41: C Cau 42: D Cau 44: A Khi k dong m^ch chi gom R noi tiep voi C =:>tan- = ^ o R = ^/3ZL(l) R Khi k ma m^ch gom R, L , C mac noi tiep ^tan(-^)= R O Z C - Z L = R(2) T i r ( l ) v a ( ) ^ Z c = (V3+l)Zi Cau 45: D Cau 46: A Dieu chinh C de UMB d^t eye d^i thi m^ch xay cpng huong di?n => cong suat tieu thy cua m^ch d^t eye d?ii la = — = 968 W R Cau 47: D Cau 48: D E)e chu ki tSng len thi gia toe hif u dyng g' < g Fqt ngugrc chieu voi P Cau 49: A 325 Cau 50: A TCr cong thuc tinh so h^t nhan l^i sau thdi gian t la N = ^ (vai k = —) 2" T => so h^t nhan l^i sau chu ki ban la Cau 51: A Tu cong thuc tinh momen Ivrc la M = ly =>I = — =0,012kgm^ Y Ma momen quan tinh cua chat diem la I = mr^ => m = 133 g Cau 52: Gpi V] va V2 Ian lugt la toe dp dai ciia diem tren mep dTa va lip coi va ©2 Ian lupt la toe dp goc cua dTa va lip Ri va R2 Ian lupt la ban kinh cua dia va lip Ta c6: vi = V2 o coiRi = CO2R2 o C02 = 2(0i Theo de bai, toe dp goc ciia banh xe la co= — - — = 15,7rad/s 0,3185 Ma toe dp goc ciia banh cung chinh la toe dp goc cua lip = > C02 = 15,7 rad/s => coi = 75 (vong/phut) Cau 53: C Cau 54: A Khi thay doi tan so f de di^n ap hai dau ty di?n l?ch pha so vol di^n ap.hai dau m^ich thi m^eh xay hi^n tupng cpng huong d i | n => 2nf= => f = 60 Hz VLC Cau 55: A Do nguon am chuyen dpng xa, nguai nghe dung yen nen ta c6 f = — = , Hz V + Vs 326 Cau56:C Gpi H la dp phong x^i cua 6*C tugmg g§ H = X,N Ho la dp phong x^i ciia ^^C khiic g6 vua mai ch^t => H© = XNQ Do hai mau g6 cung khoi luprng nen H = —^ 2" N/No = 0,65 =>2'' = o 2T = 0,65 0,65 •t = 3542 nam Cau : D Cau 57: A Cau : A Theo de bai, ta c6 9T = 18 => T = s (T: chu ki eua song) Khoang each giixa hai ngpn song ke la A, = m => toe dp truyen song v = X/T = m/s Cau 60: A Tir gian vecta, tam giac vuong t^o bai UAM, UMB.UAB ta c6 U^Q = UL(UMB - U L ) o Rj =ZL(ZC-ZL) » Z C - Z L = 50 oZc=ioon c= _I_ 121 COZr 7t 327 NHA X U A T BAN DAI HOC S U PHAM 136 Xuan Thuy - Cau Gidy - Ha Npi Di^n thogi: (04) 37547735 - Fax: (04) 37547911 I 21 Chiu trdch nhiftn xuat ban DINH VAN VANG Tong Men tQp : DINH N G Q C BAO Gidm doc : Chfu trdch nhi^m ngi dung vd ban quyen C N G T Y T N H H M T V DjCH V g V A N H O A K H A N G V I | T KHANG Ky thudt vi tinh : NGUYEN MAI DUNG Bien tdp tdi ban : hdnh: Tong phdt bia: Trinh bay THAI VIET CHAU C6ng ty TNHH MTV D|CH Vy VAN H6A K H A N G Vlf T £)/o chl: 2bisA Oinh Tien Hoang - P.Oakao - Q.l - TP.HCM 01:08 39111 564 - 08 39102 915 - 08 39105797 Fax: 08 39^10880 Email: khangvietbookstore@yahoo.conn.vn We: Jte: w\AW.nhasachkl-iangviet.vn LUy$N THI CAP T6C CAC QUdC GIA - M6N VAT Lf DANG BAI TAP IKS CAC DE THI ^•:a so : 02.02.33/66.PT2010 So lU^ng in 2000 bhn, kho 16x24 cm T-ii: Xadng in chi nh^nh NXB GIAO T H N G VAN TAI Dia chl: 92 Nam Ky Khdi NghTa, Quan 1, TP Ho Chi Minh So dang ki KHXB: 1036-2010/CXB/33-63/DHSP 22/10/2010 In xong va nOp IIAJ chieu thang 01 nam 2011 w d m •••••• -Nha sach CAO MINH 36 NguySn Thi Minh Khai Q l TP.HCM DT: 08.38227436 -Nha s a c h KHANG VIET 2bisA Dinh Ti^n H o d n g , P.Da kao, Q 1, TP.HCM DT: 08 39111564 - 39102915 - 39105797 - Fox: 08 39110880 Email: khangvietbookstore@yahoo.com.vn Website: w\AAA/.nhasachkhangviet.vn L U Y E N THI C A P T O G | C A C D A N G BAJ T A P Ttf C A C B £ T M QlKSC O U OkC l>«HG BJU T i p Ttr C A c THI a u c a t -Nha sdch MINH TRi 559 Di0n Bien Phu, TP.Dd Ndng DT: 0511.3723868 103Ly ThaiTd, Da Nang DT: 0511.3824452 L U Y E N THI C A P T O O I L U Y E N THI C A P T O C U T A P TU C A C o f THI QU6c GIA (TOT N G H I E P - T U Y E N SINH) TOAN HOC VATLY IIHOAHOC I CAC DANG BAt T A P TO CAC o£ THI Qu6c OA III! SINH HOC -:5:;:J:E-' U-i (xtfT NGHIEP - T u r i n sum) NG€r VAN HUOfNG DAN ON LtVCN GIAI TICH Hl/dfNG DAN ON LtVEN OAI s d HIidfNG D A N N L U V £ N Hl/OfNG DAN ON LUYEN HlNHHQCGliilTICH Ll/ONG G I A C www.nhasachkhangvie 935092 513416 t GIA: 59.000 ... Cau 22 ) C Tren mpt dyng cy di?n c6 ghi 22 0 V - 500 W So ghi cho biet di?n ap hi?u dyng a hai dau dyng cy la 22 0 V thi no tieu thy cong suat 500 W Cau 23 ) B Cau 24 ) C X = - = 0,75 urn 167 Cau 25 )... bao quang di?n, giai h^n quang difn chi phy thupc ban chat kim lo^i dung lam catot Cau 34) D Tu f = 2TCVLC _ c, Khi C = 0 ,25 Ci = ^ thi f: = 2f| Cau ) B Ni = 22 00 vong; U, = 22 0 V; Uj = V U, NT... t V - -25 7tsin — < Sau di dupe quang duang S = 42, 5 cm = 2. 4A + 0,5A v^t den vj tri X = -2, 5 cm = -0,5A • T V^y thai gian v^t di dugc quang duang 42, 5 cm la t = 2T + — = — s 12 Cau 2) C Cau3)C