Cdu 4: M o t m a c h dao dong l i tifdng g o m cuon c a m t h u a n c6 t\X cam 4fj,H va m o t t u d i e n c6 d i e n dung b i e n d o i tCf 10 p F d e n 640 p F Lay n' = 10 Chu k i dao dong r i e n g cua m a c h n a y c6 g i a t r i A tCr 2.10-^s den 3,6.10 ^s B tCf 4.10-^s den 2,4.10-^s C tCr 4.10-^s den , ' s D tii 2.10-^s den 3.10-^s Giai Chu k i dao dong d i e n tCf T = 2nVLC T a c o : T i = 27I7LC^ = 2W4.10-'.10.10-" = W - " « - ' s Ta = 27t7LC7 = 2W4.10"".640.10^'- = 327iV4.10"" 3,2.10"'s Vay chgn dap an C Cdu 5: K h i electron d quy dao dCfng thuf n t h i n a n g liitfng ciia nguyen tijf hidro dUcfc t i n h theo cong thufc E„ - (eV) ( n = , , 3, ) K h i n" electron t r o n g nguyen tuf h i d r o chuyen tCf quy dao dCfng n = sang quy di, J difng n = t h i nguyen tuf h i d r o p h a t r a p h o t o n ufng v d i bufc x a c6 bifdfc song b k n g : A 0,4350nm B 0,4861^m C 0,657e^im D 0,4102^m Giai Ta c6: hc 6,'625.10-'\3.10' l,889eV 1,889.1,06.10"" - , " ' = 0,6576pm Vay chgn dap an C Cdu 6: Cho ba h a t n h a n X , Y va Z c6 so nuclon tirong ufng l a Ax, Ay, Az vdfi Ax = 2AY = 0,5Az B i e t n a n g iLfdng l i e n k e t cua tCrng h a t n h a n tLforng ufng l a A Ex, A E y , AEz vdri A E z < A E x < A E y Sap xep cac h a t n h a n theo thuf txi t i n h b e n vufng g i a m d a n l a : A Y , X, Z B Y , Z, X C X , Y , Z D Z, X , Y Giai Theo de b a i A , = 2Ay = 0,5A, ^ T a l a i c6: A E ^ < A E ,