Questions
The mean lives of a radioactive sample are 30 years and 60 years for -emission and - emission respectively. If the sample decays both by -emission and -emission
simultaneously, the time after which, only one-fourth of the sample remain is
detailed solution
Correct option is C
λe=130+160=120 Now N=N0e-λet =N04=N0e-t20 ⇒t=27.72 yrsTalk to our academic expert!
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In a sample of a radioactive substance what fraction of the initial number of nuclei will remain undecayed after time T , where T = half-life of radioactive substance
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