Cdu 22: P h a t bieu nao sau day 1^ s a i k h i n o i ve d n h s^ng dcfn s^c? A A n h s4ng dan sic la anh sang khong b i tan sSc k h i d i qua lang k i n h B T r o n g cung m o t m o i trUcrng t r u y e n , v a n t6'c ^ n h sang t i m nho hcfn v a n t6'c a n h sang C T r o n g chan k h o n g , c i c d n h sang dcfn s^c khac t r u y e n d i v d i cung v a n toe D C h i e t suat cua m o t m o i tri/ofng t r o n g suot doi v6i d n h sdng d6 \&ti hon chiet suat cua m o i t n i d n g doi vdri a n h sang t i m Doi v d i a n h sdng dcfn s^c, chiet suat cua m o t m o i triTdng t r o n g su6't doi vdri a n h sang tSng len tiif den t i m V i vay chiet suat cua d n h sdng p h a i nho hcfn chiet suat cua m o i triicfng d6'i v d i a n h sang t i m Vay chgn dap an B Cdu 23: Cho doan mach g6m dien trdr t h u a n R n o i t i e p vdri t u d i e n c6 dien dung C K h i dong dien xoay chieu c6 t a n so goc (o chay qua t h i tong trdr cua doan mach l a : A ^ R ' + ( c o C ) ' B |R' + B ^ R ' - ( a ) C ) ' D R' - coC Giai T o n g trcf cua doan mach l a : Z = ^R^ + Vdy chgn dap an = R^ + J B Cdu 24: Theo t h u y e t Ufgrng tuf a n h sang t h i nSng liTOng cua A m g t p h o t o n t i le t h u a n v d i biTdc song a n h sang tiTcfng l i n g v d i photon B m o t p h o t o n b^ng nSng liigfng n g h i cua m o t electron (electron) C m o t p h o t o n p h u thuoc vao khoang cdch tCr p h o t o n t d i nguon p h d t no D n S c p h o t o n t r o n g chum sang dcfn s^c b^ng Theo t h u y e t liTcfng tijf a n h sdng t h i nSng 'k/dng cua cac ph6t6n t r o n g chum sdng dcfn s^c b k n g Vdy chgn dap an D GAi C h i t\6x thi O H , C O M6n V $ t If 11