... l: A 3, 012. 10-19J B 3,975.10-19J C 19,975.10-19J D 6,625.10-19J Cõu 27: Ht nhõn nguyờn t chỡ cú 82 prụtụn v 125 ntrụn Ht nhõn nguyờn t ny cú kớ hiu nh th no? 125 82 82 207 A 82 Pb B 125 Pb C ... ca mt mch dao ng gm mt t in cú in dung 200pFv mt cun cm cú t cm 0.02H l: A 125 10 -4 s B .125 10 -5 s C .125 10 -6 s D .125 10 -3 s Cõu 3:Phỏt biu no sau õy sai núi n tớch cht tia X A Lm en kớnh ... ; 12 D A Z A Z D 12 D ; Li ; 24 He X vi chu kỡ bỏn ró l 15gi Lỳc u mu Natri l nguyờn cht Ti thi im kho sỏt thy t s gia lng X v lng natri cú mu l 0,75 Hóy tỡm tui ca mu natri A 1,212gi B 2,112gi...