The radioactivity of a sample is \( R_{1} \) at a time \( T_{1} \) and \( R_{2} \) at a time \( ...
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0The radioactivity of a sample is \( R_{1} \) at a time \( T_{1} \) and \( R_{2} \) at a time \( T_{2} \). If the half-life of the specimen is \( T \), the number of atoms that have disintegrated in the time \( \left(T_{2}-T_{1}\right) \) is proportional to:
(A) \( \left(R_{1} T_{1}-R_{2} T_{2}\right) \)
(B) \( \left(R_{1}-R_{2}\right) \)
(C) \( \left(R_{1}-R_{2}\right) / T \)
(D) \( \left(R_{1}-R_{2}\right) T / 0.693 \)
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