The half-life of .^(215) At is 100 mu s....

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 `1//16^(th)` of its initial value is

`400 mus`

`6.3 mus`

`40 mus`

`300 mus`

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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 dacay to 1//16^(th) of its initialy value is

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