Problem

Problem

The half-life of

^{215}\text{At}

is

100 \mu\text{s}

. The time taken for the activity of a sample of

^{215}\text{At}

to decay to

\frac{1}{16}

th of its initial value is (JEE 2002) a.

400 \mu\text{s}

b.

63 \mu\text{s}

c.

40 \mu\text{s}

d.

300 \mu\text{s}

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