The decay constant for mercury-197,a radioisotope used medically in kidney-scans, is $1.08 \times 10^{- 2} h^{- 1}$ . What is the half-life of mercury-197?

54.37 h

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64.17 h

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65.27 h

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None of these

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Solution

The correct option is B 64.17 h
`As we know, for a first order reaction,
$λ = \frac{0.693}{t_{1 / 2}}$
$t_{1 / 2} = \frac{0.693}{1.08} \times 10^{- 2} = 64.1 h$

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The decay constant for mercury-197,a radioisotope used medically in kidney-scans, is 1.08×10−2h−1. What is the half-life of mercury-197?

The correct option is B 64.17 h`As we know, for a first order reaction,λ=0.693t1/2t1/2=0.6931.08×10−2=64.1 h

The decay constant for mercury-197,a radioisotope used medically in kidney-scans, is $1.08 \times 10^{- 2} h^{- 1}$ . What is the half-life of mercury-197?

The correct option is B 64.17 h
`As we know, for a first order reaction,
$λ = \frac{0.693}{t_{1 / 2}}$
$t_{1 / 2} = \frac{0.693}{1.08} \times 10^{- 2} = 64.1 h$