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Questions  >>  JEEMAIN and NEET  >>  Physics  >>  Class12  >>  Atoms
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Q)

The half life of $\;^{215}At\;$ is $\;200 \mu s\;$ . The time taken for radioactivity of a sample of $\;^{215}At\;$ to decay to $\;{\large\frac{1}{4}}^{th}\;$ of its initial value is

$(a)\;100\;\mu s\qquad(b)\;300\;\mu s\qquad(c)\;200\;\mu s\qquad(d)\;400\;\mu s$

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