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Question : 7 of 180
Marks:
+1,
-0
Solution:
The undecayed nuclei in a radioactive sample are given by
N=N0(‌)‌Given,
‌‌N=N0−‌N0=‌N0,t=2h⇒‌‌‌=N0(‌)‌⇒‌‌(‌)‌=‌=(‌)4⇒‌‌‌=4⇒t1∕2=‌h=30‌min∴ Mean life,
τ=1.44t1∕2=1.44×30=43.2‌min≃43‌min
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