Class 12 Physics Modern Physics Modern Physics - 2



The half-lives of radioactive sample are 30 years and 60 years for two decay processes. If the sample decays by both the processes simultaneously. The time after which, only one-fourth of the sample will remain is
(a)
10 years
(b)
20 years
(c)
40 years
(d)
60 years
Correct answer: (c) 

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simple harmonic motio
modern physics
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nuclear physic
semiconducting device