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The count rate of a Geiger Muller counte...

The count rate of a Geiger Muller counter for the radiation of a radioactive material of half-life `30` min decreases to `5 s^(-1)` after `2 h`. The initial count rate was

A

`25 s ^(-1)`

B

`80 s^(-1)`

C

`625 s^(-1)`

D

`20 s^(-1)`

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The correct Answer is:
B
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