The radioactivity of a sample is X at time t1 and Y and a time t2. If the mean life time of the specimen is τ, the number of atoms that have disintigrated in the time interval t1−t2 is
A
Xt1−Yt2
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B
X−Y
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C
X−Yτ
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D
(X−Y)τ
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Solution
The correct option is D(X−Y)τ X=λN1Y=λN2N1−N2=X−Yλ=(X−Y)τ