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Gi^i Hai v a n sang t r u n g nen: 5X^ = kXj => k = = ^2 Vdy chon dap an B Cdu 27: Chiet suat cua m o t t h u y t i n h doi vdri m o t a n h sang dorn s S c la 1,6852 Toe cua a n h sang t r o n g t h u y t i n h l a : A l , W s B l , W s C l , W s D l,87.10Ws T a c o : v = - = ^'^^ = l , W s n 1,6852 Vdy chon dap an A Cdu 28: Quan sat song dCtog t r e n scfi day A B , dau A dao dong dieu hoa theo phtfcfng vuong goc vdri spi day (coi A la n u t ) dau B t i i va Vdri tan so dao dong cua dau A l a 22 Hz t h i t r e n day c6 n u t Neu dau B CO dinh va coi toe t r u y e n song t r e n day nhiT cu, de vSn c6 n u t t h i tan so dao dong cua dau A p h a i b k n g : A 18 Hz Taco: B 25 Hz C 23 H z D 20 H z K h i B t u do: / = (2k + l ) - = (2.5 + ) - ^ = 1 - ^ , 4f, 4f, (1) K h i B CO d i n h : / = k - = — 2f2 (2) TCf (1) v a 2) suy r a : fa = 20Hz Vdy chon dap an D Cdu 29: T r e n m o t stfi day dan h o i dang c6 song dCfng K h o a n g each tii mot n u t den m o t b u n g k e n o bang A m o t nufa biTdrc song C m o t p h a n tu hudc song B h a i bifdc song D m o t birdrc song T r e n m o t spi day dan h o i dang c6 song dufng K h o a n g each tCr mcTt nut den m o t bung k e n o b k n g m o t p h a n tiT h\i6c song Vdy chon dap an C Giii Chi ti^t 66 thi TS DH CO M6n V$t If 141 Cdu 30: GiOfa anot va catot cua mot ong phat tia X c6 hieu dien the khong ddi la 25 kV Bo qua dong nang cua electron buft tOf catot Birdfc song nghn nhat cua tia X ma ong c6 the phat bkng: A 31,57 pm B 39,73 pm C 49,69 pm D 35,15 pm he he Ta co: — = e U ^ , ^ ^,„,„ = — — = 49,69 pm ^ AK mrn y, Vay chqn dap an C Cdu 31: M o t k i m l o a i c6 gidfi h a n quang dien l a X Q Chieu bufc xa c6 hxidc song bang ^ vao k i m loai n a y Cho r k n g n a n g Itfofng ma electron quang dien h a p t h u tCr photon cua bufc xa t r e n , m o t p h a n dung de g i a i phong n o , p h a n l a i bien hoan toan t h a n h dong nang cua no Gia t r i dong n a n g n a y l a : A ^ B.J^ C ^ D ^ Giai T a c =^ + W,=>W,=^-^ = 2^ X X XQ XQ ^ Vdy chon dap an D Cdu 32: K h i n o i ve a n h sang dcfn sac, phat bieu nao sau day dung? A A n h sang dcfn sac k h o n g b i t a n sfic k h i t r u y e n qua l a n g k i n h B A n h sang t r a n g l a a n h sang dcfn skc v i no c6 mau t r a n g C Toe t r u y e n cua m o t a n h sang dcfn sac t r o n g niXdc va k h o n g k h i l a nhiX D T r o n g t h u y t i n h , eac a n h sang dcfn sac khac t r u y e n v6i toe nhif Giai Chi CO dap an A diing, cdc dap an lai deu sai Cdu 33: T r o n g mach dao dong L C l i tLfdng dang c6 dao dong dien til tiX do, cifofng dong d i e n t r o n g maeh v a hieu dien the giUa h a i b a n t u dien l3eh p h a m o t goc bSng: A - B 71 C - 142 D GiaichitifitdlthiTSDH, CE)M6nV$tl( Giai Trong mach dao dong L C l i ttfdng dang c6 dao dong d i e n tCf t\i do, CLfdng dong dien t r o n g mach va hieu dien the giffa h a i b a n t u dien lech pha m o t goc bang Vay chgn dap an C Cdu 34: K h i n o i ve t i a tuT ngoai, p h a t bieu nao sau day s a i ? A T i a tijf ngoai la song dien tii c6 t a n so nho hofn t a n so cua a n h sang t i m B T r o n g y hoc, t i a tijf ngoai dtrofc dung de chOfa b e n h coi xiiofng C T r o n g cong nghiep, t i a tuf ngoai difcrc dung de p h a t h i e n cac vet nurt t r e n be mSt cac san p h a m k i m loai D T i a tuf ngoai c6 tac dung m a n h l e n p h i m a n h Giai Phat bieu sai l a : T i a tuf ngoai l a song d i e n tuf c6 t a n so nho horn tan so cua a n h sang t i m Vay chgn dap an A Cdu 35: K h i n o i ve h a t sof cap, p h a t bieu nao sau day d u n g ? A Ncftrino la h a t sof cap c6 k h o i luang n g h i bang k h o i lUgfng n g h i cua electron B Tap htfp cac mezon va cac barion c6 t e n chung la cac h a d r o n C P r o t o n la h a t scf cap c6 p h a n h a t la nortron D P h a n tuf, nguyen tuf l a nhufng h a t scf cap Giai Chi CO dap an B dung, cac dap an lg,i diu sai Cdu 36: D a t dien ap xoay chieu u = Uocos27cft (Uo k h o n g doi, f thay doi dirgrc) vao hai dau doan mach chi c6 t u dien Phat bieu nao sau day dung? A D i e n ap giufa h a i dau doan mach s6m pha so v d i ciTdng dong dien t r o n g doan mach B Ctfcfng dong dien hieu dung t r o n g doan mach cang lorn k h i tan so f cang I d n C Dung k h a n g cua t u dien cang I d n k h i t a n so f cang Idm D Ctfcfng dong dien hieu dung t r o n g doan mach k h o n g doi k h i tan so f t h a y doi GiSi chi tiet thi TS DH, CD M6n vat l( 143 ... h a t scf cap Giai Chi CO dap an B dung, cac dap an lg,i diu sai Cdu 36: D a t dien ap xoay chieu u = Uocos27cft (Uo k h o n g doi, f thay doi dirgrc) vao hai dau doan mach chi c6 t u dien Phat... a hieu dien the giUa h a i b a n t u dien l3eh p h a m o t goc bSng: A - B 71 C - 1 42 D GiaichitifitdlthiTSDH, CE)M6nV$tl( Giai Trong mach dao dong L C l i ttfdng dang c6 dao dong d i e n... dong n a n g n a y l a : A ^ B.J^ C ^ D ^ Giai T a c =^ + W,=>W,=^-^ = 2^ X X XQ XQ ^ Vdy chon dap an D Cdu 32: K h i n o i ve a n h sang dcfn sac, phat bieu nao sau day dung? A A n h sang
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