A radioactive substance takes 20 min to decay 25%. How much time will – InterviewSolution

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1.	A radioactive substance takes 20 min to decay 25%. How much time will be taken to decay 75%
Answer» 96.4 min 68 min 964 min 680 min Solution :For 25% DECAY `K = (2.303)/(20) "log"(100)/(75) = (2.303)/(20) xx 0.1249 = 0.1438` For 75% decay `t = (2.303)/(0.01438) "log" (100)/(25) = 96.4` MINUTE

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