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Question

The decay constant for mercury-197,a radioisotope used medically in kidney-scans, is 1.08×102h1. What is the half-life of mercury-197?

A
54.37 h
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B
64.17 h
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C
65.27 h
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D
None of these
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Solution

The correct option is B 64.17 h
`As we know, for a first order reaction,
λ=0.693t1/2
t1/2=0.6931.08×102=64.1 h

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