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Ninety precent of a radoactive sample is...

Ninety precent of a radoactive sample is left over after a time interval t. The percentage of initial sample that will disntegrate in an interval 2t is-

A

`38%`

B

`19%`

C

`9%`

D

`62%`

Text Solution

Verified by Experts

The correct Answer is:
B

In time interval of 't' . `10%` decays so in next interval of 't' again `10%` of remaining sample will decayed hence total `81%` sample in left so `19%` will decay.
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