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Q.

A radioactive sample had an initial activity of 56 dpm. After 69.3 minutes, it was found to have an activity of 28 dpm. Find the number of atoms in a sample having an activity of 100 dpm

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a

693

b

100

c

1000

d

10,000

answer is D.

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Detailed Solution

K=0.69369.3=10−2min−1N=−dN/dtK=10010−2=10,000
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