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A radioactive sample is alpha-emitter wi...

A radioactive sample is `alpha-`emitter with half life `138.6` days is observed by a student to have `2000` disintegration/sec. The number of radioactive nuclei for given activity are.

A

`3.45xx10^(10)`

B

`1xx10^(10)`

C

`3.45XX10^(15)`

D

`2.75xx10^(11)`

Text Solution

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The correct Answer is:
A
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