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The half lives of a radioactive sample a...

The half lives of a radioactive sample are 30 years and 60 years from `alpha`- emission and `beta`- emission respectively If the sample decays both by alpha-emission and `beta`-emission simultaneously, the time after which, only one-fourth of the sample remain is

A

18 years

B

20 years and 10 years, respectively

C

28 years

D

45 years

Text Solution

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The correct Answer is:
C
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