Questions
In a sample of radioactive material, what percentage of the initial number of active nuclei will decay during one mean life?
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a
69.3%
b
63%
c
50%
d
37%
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Correct option is B
Number of atoms remains undecayed N=N0e-λtNumber of atoms decayed =N0(1-e-λt)=N01-e-λ x 1λ=N01-1e =0.63 N0=63% of N0.Similar Questions
The half life period of a radioactive element X is same as the mean life time of another radioactive element Y. Initially both of them have the same number of atoms. Then
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