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The count rate meter is used to measure that activity of a given amount of a radio active element. At one instant, the meter shows 475 counts/minute. Exactly 5 minutes later, is shown 270 counts/minute then
Mean life of the sample is ( in minutes)

A

6.35

B

7.45

C

8.85

D

9.92

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`tau=(1)/(lambda)`
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