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.
693
1000
100
10,000
A
693
B
10,000
C
1000
D
100
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Solution
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The expression for the activity is A=λN=0.693×Nt1/2
t12=69.3min
Substitute values in the above expression: 10=0.693×N69.3
N=1000
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