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A radioactive nucleus A with a half-life...

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

A

`t = (T)/(2)(log2)/(log1.3)`

B

`t = T(log1.3)/(log2)`

C

`t = Tlog(1.3)`

D

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

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