Half-life of ^{215}At is 100μ s . time taken for radioactivity of a sample of ^{215}At to decay to

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13.Nuclei

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The half-life of $^{215}At$ is $100\mu s$. The time taken for the radioactivity of a sample of $^{215}At$ to decay to $\frac{{1}}{{16}} \,th$ of its initial value is .........$\mu s$

A

$400$

B

$6.3$

C

$40$

D

$300$

(IIT-2002)

Solution

(a) The radioactivity of a sample decays to $\frac{1}{{16}} \,th$ of its initial value in four half lives.

Standard 12

Physics

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