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 that has an activity of 100 dpm.
A
693
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B
100
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C
1000
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D
10,000
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Solution
The correct option is D 10,000 Given No=56λ N69.3=28λ Nt=100λ λ×69.3=ln5628 λ=ln269.3 =0.01 1000.01=Nt Nt=104