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

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

A

` 400 mu sec`

B

` 6.3 mu sec `

C

` 40 mu sec`

D

`300 mu sec`

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