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The decay constants of a radioactive sub...

The decay constants of a radioactive substance for `alpha` and `beta` emission are `lambda_(alpha)` and `lambda_(beta)` respectively. If the substance emits `alpha` and `beta` simultaneously, then the average half life of the material will be

A

`(2T_(alpha)T_(beta))/(T_(alpha)+T_(beta))`

B

`T_(alpha)+T_(beta)`

C

`(T_(alpha)T_(beta))/(T_(alpha)+T_(beta))`

D

`(1)/(2)(T_(alpha)+T_(beta))`

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