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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

`400mus`

B

`6.3mus`

C

`40mus`

D

`300mus`

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The correct Answer is:
A
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