Cdu 5: Chieu x i e n m o t chum sang hep gom h a i a n h sang dotn sac la v a n g va l a m tCf k h o n g k h i t d i m a t niidfc t h i A chum sang b i p h a n xa t o a n phan B so vofi phutfng t i a tdi, tia khiic xa vang bi lech i t hcfn tia khuc xa lam C so vdi phutfng t i a tdi, tia khuc xa lam bi lech i t hcfn tia khuc xa vang D t i a khuc xa chi la a n h sang vang, t i a sang l a m b i phan xa toan p h a n Giai Chieu x i e n m o t chum sang hep gom h a i a n h sang dofn sac la vang va l a m tCf k h o n g k h i t d i m a t niidc t h i so v d i phtfcfng t i a t d i , t i a khuc xa v a n g b i lech i t hofn t i a khuc xa l a m Vay chgn dap an B Cdu 6: Biidc song la k h o a n g each giuTa h a i diem: A gan n h a t ma dao dong t a i h a i diem cung pha B t r e n cung m o t phiJorng t r u y e n song ma dao dong t a i h a i diem cung pha C t r e n cung m o t phifofng t r u y e n song ma dao dong t a i h a i diem ngi/dc pha D gan n h a t t r e n ciing m o t phiidng t r u y e n song m a dao dong t a i h a i d i e m cung pha Giai Birdc song la k h o a n g each giiJa h a i diem gan n h a t t r e n cung m o t phiTcfng t r u y e n song ma dao dong t a i h a i d i e m cung pha Vay chgn dap an D Cdu 7: Gia suf h a i h a t n h a n X va Y c6 h u t k h o i bSng va so nuclon eua h a t n h a n X I d n h d n so nuclon cua h a t n h a n Y t h i A h a t n h a n X ben vffng h d n h a t n h a n Y B n a n g lUdng l i e n k e t cua h a t n h a n X I d n h d n n a n g liTdng l i e n k e t cua h a t n h a n Y C n a n g Itfdng l i e n k e t r i e n g cua h a i h a t n h a n b^ng D h a t n h a n Y b e n vOfng h d n h a t n h a n X Giai V i h a i h a t n h a n ed h u t Idioi bang n e n AE, = AE^ = AE 30 Giai C h i tiet dS thi TS O H , C D Mon Vat li