The radioactivity of a sample is R1at a time T1 and R2 at a time T2 . If the half-life of the specimen is T , the number of atoms that have disintegrated in the time T2−T1 is proportional to
A
T2−T1α(R1−R2)T
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B
(R1−R2)
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C
(R1−R2)/T
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D
(R1−R2)T
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