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Question

A certain substance decays to 132 of its initial activity in 25 days. The half life is:

A
1 day
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B
3 days
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C
5 days
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D
7 days
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Solution

The correct option is B 5 days
Let the half life be λ days.
Substance decays to 1/2 of it in λ days.
Substance decays to 1/4 of it in 2λ days.
Similarly Substance decays to 1/32 of it in 5λ days. [i.e. 25 days]
5λ=25
λ=5days

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