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Q .     A radioactive material decays by simultaneous
emission of two particles with respective half-lives `T_1`
and `T_2` . The effective half-life of material is

BITSAT 2016
A

`sqrt(T_1+T_2)`

B

`(T_1 T_2)/(T_1+T_2)`

C

`T_1//T_2`

D

`(T_1+T_2)/2`

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