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A radioactive nucleus A with a half life...

A radioactive nucleus A with a half life T, decays into nucleus B. At t=0, there is no nucleus B. At somewhat t, the ratio of the number of B to that of A is 0.3 . Then, t is given by

A

`t=T log(1.3)`

B

`t= T/(log 1.3)`

C

`t=T/2 (log 2)/(log 1.3)`

D

`t=T(log 1.3)/(log 2)`

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The correct Answer is:
D
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