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Question

If half-life of a substance is 5 yrs, then the total amount of substance left after 15 years, when initial amount is 64 grams is:

A
16 grams
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B
2 grams
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C
32 grams
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D
8 grams
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Solution

The correct option is D 8 grams
Let us consider the problem.
Half life=5year
Initial amount of substance=64grams
TotaltimeelapsedT=15years
Therefore
For 5 years, the 64 grams will be reduced to 32 grams
For 10 years this 32 grams will be further reduced to 16 grams
and in 15 years this 16 grams will be reduced to 8 grams
Thus, D is the correct answer.

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