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Cdu 36: D a t d i e n ap xoay chieu u = u V c o s l 0 i t vao h a i dau doan mach m ^ c n o i tiep gom dien t r d t h u a n R, t u d i e n c6 d i e n dung C va cuon cam t h u a n c6 tiX cam L thay doi difcfc Dieu c h i n h L de d i e n ap hieu dung cf h a i dau cuon cam dat gia t r i cifc d a i t h i t h a y gia t r i CLTC dai b k n g 100 V va dien ap hieu dung d h a i dau t u d i e n bang 36 V Gia t r i cua U l a : A 64 V B 80 V C 48 V D 136 V Giat K h i dieu c h i n h L de dien ap hieu dung of h a i dau cuon cam dat gia tri CLfc dai t h i URC vuong pha v i u, ta c6: S u y r a : U = ^V^{V^-Vc) U^=U^+(U,-Ue)' ^ ^m{\00-26) = S0 (V) Vay chgn dap an B Cdu 37: M o t chat diem dao dong dieu hoa t r e n true Ox vdri b i e n 10cm, chu k i 2s Moc the n a n g d v i t r i can b k n g Toe dp t r u n g b i n h cua chat diem t r o n g khoang thcfi gian ngan n h a t k h i chat d i e m d i tCf v i t r i CO dong n a n g bang Ian the n a n g den v i t r i c6 dong nSng b a n g ^ I a n the nang l a : A 26,12 cm/s B 21,96 em/s C 7,32 cm/s D 14,64 em/s Giai T h d i gian n g ^ n n h a t vat d i tCf v i t r i c6 dong nang b^ng I a n the n a n g de'n v i t r i CO dong n a n g bang Ian the n a n g chiing ta CO the bieu d i e n nhiT t r e n h i n h ben TCf h i n h ve suy r a : ^> = - = S = V3 nt^t=-{s) v = ( > / - l ) = 21,96(cm/s) A Vdy chon dap an B Gi4i Chi ti«t dS thi TS BH, CD M6n V$t II 123 Cdu 38: K h i n o i ve t i a y , p h a t bieu nao sau day s a i ? A T i a Y C O k h a nkng d a m xuyen m a n h horn t i a X B T i a y k h o n g p h a i la song dien tiT C T i a y C O t a n so Idfn hcfn t a n so cua t i a X D T i a y k h o n g m a n g dien Giai T i a y l a m o t song d i e n tCf c6 bifdc song r a t ngan nho horn 10"^^m Vay chgn dap an B Cdu 39: T r o n g t h i n g h i e m Y-ang ve giao thoa a n h sang, khe hep S p h a t r a dong thofi ba buTc xa dcto sSc c6 hiidc A,2=0,56^m va song la X,, =0,42n,m, >.3=0,63|im T r e n m a n , t r o n g k h o a n g giOfa h a i van sang l i e n t i e p c6 mau giong mau v a n t r u n g t a m , neu h a i v a n sang cua h a i bufc xa t r i j n g t a chi t i n h la mot v a n sang t h i so v a n sdng quan s a t diftfc l a : = :8 :9 T a c o : X, : A.^ : B 26 A 27 C 21 D 23 Giai V i t r i t r u n g v a n ufng vdfi: kX = kjXj - k , } , =^ 6k, = Skj = 9k = 72n Tinhra k,=12, k2=9, k3=6 So v a n t r u n g l a b o i cua cap: (6, 8) = 24; 48, 72; (6, 9) = 18; 36; 54, 72; (8, 9) := 72 T o n g so v a n quan sat: 12 + + - = 21 Vay chgn dap an C Cdu 40: H i e n ti/gfng quang dien ngoai l a h i e n tifgrng electron b i hurt "khoi t a m k i m l o a i k h i A chieu vao t a m k i m loai m o t bufc xa d i e n tii c6 bifdrc song t h i c h htfp B cho dong d i e n chay qua t a m k i m loai C t a m k i m loai b i nung nong bdi m o t nguon n h i e t D chieu vao t a m k i m loai m t chum h a t n h a n h e l i 124 Giai chi tiet as thi T S OH, C D MSn vat li Giai H i e n tifgrng quang dien ngoai la h i e n Wtfng electron b i buft r a k h o i tarn k i m loai k h i chieu vao tarn k i m loai m o t buTc xa d i e n tCr c6 budfc song t h i c h htfp Vay chpn dap an A Cdu 41: Mach dao dong dien tCr L C gom m o t cuon day c6 t\i cam 50mH va t u dien c6 dien dung |x F Neu mach c6 dien trcf t h u a n 10"^ Q , de t r i dao dOng t r o n g mach v d i hieu d i e n the ciic d a i giiJa h a i b a n tu dien la 12V t h i phai cung cap cho mach mot cong suat t r u n g b i n h bang A 36 n W B 36 m W C 72 ^ W D 72 m W Giai Tacoriu^^lcU^ Cong suat cap b u : P = - I ^ R = - - U ^ R = 72.10^ W = 72pW Vqy chgn dap an C Cdu 42: D a t dien ap xoay chieu u = U N / coslOOTit ( U k h o n g doi, t t i n h bang s) vao h a i dau doan mach mSc n o i tiep gom" d i e n trof t h u a n R, cuon cam t h u a n c6 tU cam — H va t u dien c6 d i e n dung C thay doi 57t di/oc Dieu c h i n h dien dung cua t u dien de d i e n ap h i e u dung giuTa h a i ban t u dien d a t gia t r i cifc d a i Gia t r i ciic d a i b a n g uV3 D i e n t r d R bang: A Q B N / Q C 2OV2Q D lOQ Giai T a c6: ZL = (o.L = Q Uc„ =-^^^^^^ = = = ^ R = ^ = loVSn Vqy chgn dap an B Cdu 43: M o t lac dcfn dang dao dong dieu hoa v6i b i e n goc ao tai nofi c6 gia toe t r o n g triTcfng la g B i e t lire cang day lorn n h a t bang 1,02 I a n liic cang 6ky nho nhat Gia t r i cua tto l a : A 6,6° Giai Chi tiSi B 3,3^ thi T S D H , C D Mon Vat li C 9,6° D 5,6° 25 ... = Skj = 9k = 72n Tinhra k,= 12, k2=9, k3=6 So v a n t r u n g l a b o i cua cap: (6, 8) = 24 ; 48, 72; (6, 9) = 18; 36; 54, 72; (8, 9) := 72 T o n g so v a n quan sat: 12 + + - = 21 Vay chgn dap... sang cua h a i bufc xa t r i j n g t a chi t i n h la mot v a n sang t h i so v a n sdng quan s a t diftfc l a : = :8 :9 T a c o : X, : A.^ : B 26 A 27 C 21 D 23 Giai V i t r i t r u n g v a n ufng... la 12V t h i phai cung cap cho mach mot cong suat t r u n g b i n h bang A 36 n W B 36 m W C 72 ^ W D 72 m W Giai Tacoriu^^lcU^ Cong suat cap b u : P = - I ^ R = - - U ^ R = 72. 10^ W = 72pW
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