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The half -life of cobalt-60 is 5.25 year...

The half -life of cobalt-60 is 5.25 years. How long after a new sample is delivered, will the activity have decreased to about one third `(1//3)` of its original value-

A

5.25 years

B

8.3 years

C

10.50 years

D

15.75 years

Text Solution

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The correct Answer is:
B
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