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Question

The activity of a radioactive substance is R1 at time t1 and R2 at time t2(>t1). Its decay constant is λ. Then:

A
R1t1=R2t2
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B
R2=R1eλ(t2t1)
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C
R2=R1eλ(t1t2)
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D
R1R2t2t1= constant
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