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A radioactive sample had an initial act...

A radioactive sample had an initial activily of 56 dpm (disintegration per min). After `69.3 min` it was found to have an activity of 28 dpm. Find the number of atoms in a sample having an activity of 10 dpm.

A

693

B

1000

C

100

D

10000

Text Solution

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The correct Answer is:
B
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