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The decay constants of a radioactive sub...

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

A

`lambda_(alpha) - lambda_(beta)`

B

`lambda_(alpha) + lambda_(beta)`

C

`(lambda_(alpha) lambda_(beta))/(lambda_(alpha) + lambda_(beta))`

D

None of these

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The correct Answer is:
C
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