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Which radioactive isotope would have the...

Which radioactive isotope would have the longer half- life `"^(15)O` or `""^(19)O`? (Given rate constants for `""^(15)O` and `""^(19)O` are `5.63 xx 10^(-3) s^(-1)` and k =`2.38 xx 10^(-2) s^(-1)` respectively.)

A

`""^(15)O`

B

`""^(19)O`

C

Both will have the same half-life

D

None of the above, information given is insufficient

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