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Question

The activity of a sample of radioactive element is A1 at time t1 and A2 at time t2(t2>t1). The mean life of sample is T, then :

A
A1t1=A2t2
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B
A1A2t2t1=constant
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C
A2=A1e(t1t2)/T
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D
A2=A1e(t1/Tt2)
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