Questions
The mean lives of a radioactive substance are 1620 years and 405 years for α -emission and β-emission respectively. The time during which three fourth of a sample will decay if it is decaying both by α -emission and β-emission simultaneously.
detailed solution
Correct option is A
Total decay constant is λ=1τ1+1τ2=11620+1405=1324sec-1 t=1λln4=324×ln4=449 yrTalk to our academic expert!
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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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