InterviewSolution
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InterviewSolution
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At a given instant, there are 25% undecayed radioactive nuclei in a sample. After 10 seconds the number of undecayed nuclei reduces to 12.5%, the mean life of the nuclei isA. 10.21 sB. 14.43 sC. 5.31 sD. 7.43 s |
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Answer» Correct Answer - b As the number of undecayed nuclei decreases from 25% to 12.5% in 10 s, it shows that the half life of the sample is 10 s, i.e. `T_(1//2)` =10 s Decay constant ,`lambda=0.06931/T_(1//2)=0.6931/"10 s"` Mean life , `tau = 1/lambda= "10 s"/0.6931 =14.43 s` |
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