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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

`80 "second"^(-1)`

B

`625 "second"^(-1)`

C

`20 "second"^(-1)`

D

`25 "second"^(-1)`

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The correct Answer is:
A
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