The half-life of .^(215)At is 100 mus. T...

The half-life of `.^(215)At` is `100 mus`. The time taken for the radioactive of a sample of `.^(415)At` to decay to `1//16^(th)` of its initial value is :

` 400 mu sec`

` 6.3 mu sec `

` 40 mu sec`

`300 mu sec`

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