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The radioactivity of a sample is \( R_{1} \) at time \( T_{1} \) and \( R_{2} \) at time \( T_{2} \). If the half life of the specimen is \( T \). Number of atoms that have disintegrated in time \( \left(\mathrm{T}_{2}-\mathrm{T}_{1}\right) \) is proportional to
(A) \( \left(\mathrm{R}_{1} \mathrm{~T}_{1}-\mathrm{R}_{2} \mathrm{~T}_{2}\right) \)
(B) \( \left(\mathrm{R}_{1}-\mathrm{R}_{2}\right) \mathrm{T} \)
(C) \( \left(\mathrm{R}_{1}-\mathrm{R}_{2}\right) / \mathrm{T} \)
(D) \( \left(R_{1}-R_{2}\right)\left(T_{1}-T_{2}\right) \)
\( P \)
W
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