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InterviewSolution
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If halfe-life of a substance is 5 yrs, then the total amount of substance left after 15 years, when initial amount is 64 grams isA. 16 gramsB. 2 gramsC. 32 gramsD. 8 grams |
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Answer» Correct Answer - D `t_(1//2) = 5 yrs, t = 15 yrs` `:. n = (t)/(t_(1//2)) = (15)/(5) = 3` Now `N = (N_(0))/(2^(n)) = (N_(0))/(2^(3)) = (1)/(8) N_(0) = (1)/(8) xx 64 = 8` grams, |
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