Question

A radioactive sample had an initial activity 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

10,000

Hard
Solution
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Correct option is B)

The expression for the activity is
 

Substitute values in the above expression:


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