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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`

Text Solution

Verified by Experts

The correct Answer is:
B
(b) Read time for `50` count rate, it gives half-life period of `3 hrs`, one small square gives `600` counts `(10 xx 60)`. The number of small squares between graph and time axis are approximately `24`
Hence count rate `= 24 xx 600 = 14400`.
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