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The hall lives of a radioactive sample a...

The hall 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 emission simultaneously, the time after which only one-fourth of the sample remain is

A

10 years

B

20 years

C

40 years

D

45 years

Text Solution

Verified by Experts

The correct Answer is:
C
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