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At a given, t = 0, two radioactive subst...

At a given, t = 0, two radioactive substances A and B have equal activities. The ratio `(R_(B))/(R_(A))` of their activities after time t itself decays with time t as `e^(-3t)`, If the half-life of A is ln2, the half-life of B is :

A

`4ln2`

B

`(ln2)/(2)`

C

`(ln2)/(4)`

D

`2ln2`

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