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The count rate of 10 g of radioactive ma...

The count rate of `10 g` of radioactive material was measured at different times and times has been shown in the figure. The half-life of material and the total counts (approximately) in the first half life period, respectively are.
.

A

4h,9000

B

3h,14000

C

3h,235

D

3h,50

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The correct Answer is:
B
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