decays into a nucleus B. At t=0

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A radioactive nucleus A with a half-life T, decays into a nucleus B. At t=0, there is no nucleus B. After sometime t, the ratio of the number of B to that of A is 0.3. Then, t is given by :
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Nov
A radioactive nucleus A with a half-life T, decays into a nucleus B. At t=0, there is no nucleus B. After sometime t, the ratio of the number of B to that of A is 0.3. Then, t is given by : A radioactive nucleus A with a half-life T decays into a nucleus B. [...]
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Tags: A radioactive nucleus A with a half-life T , decays into a nucleus B. At t=0 , t is given by , the ratio of the number of B to that of A is 0.3. Then , there is no nucleus B. After sometime t ,