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Question

The activity of a radioactive sample is A1 at time t1 and A2 at time t2. If τ is average life of sample then the number of nuclei decayed in time (t2t1) is


A

A1t1A2t2

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B

(A1A2)2τ

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C

(A1A2)(t2t1)

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D

(A1A2)τ

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