1.

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 is

Answer»

16 GRAMS
2 grams
32 grams
8 grams

Solution :`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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