... ph thuc mụi trung C B nhiu x gp vt cn D Truyn c chõn khụng 14 14 Cõu 37 Ht nhõn C cú lng ht nhõn 13 ,99991u Tớnh nng lng liờn kt ca C ? Vi mp =1, 00728u, mn =1, 00866u, 1u=9 31, 5MeV/c2 A 10 5,3MeV B ... bao nhiờu ? A 15 .10 -3J B 25 .10 -3J C 2 .10 -3J D 4 .10 -3J Cõu 34 Hai súng cựng pha : A = 2k B = (2k + 1) C = ( k + 1/ ) D = (2k 1) Cõu 35 Cun cm thun L=0,2H c mc ni tip vi t C= 318 àFvo mng ... i ca cỏc electron bt kim loi ú l? A 3,06 .10 -19 J B 2,73 .10 -19 J C.6,03 .10 -19 J D.3,60 .10 -19 J 60 Cõu 30 Cụban 27 Co phúng x - vi chu k bỏn ró T = 5,27nm Thi gian 75% lng ca mt cht phúng 60 x 27...