Atoms And Nuclei Question 372

Question: The activity of a radioactive sample is measured as N0 counts per minute at t=0 and N0/e counts per minute at t=5 minutes. The time (in minutes) at which the activity reduces to half its value is

Options:

A) loge2/5

B) 5loge2

C) 5log102

D) 5loge2

Show Answer

Answer:

Correct Answer: D

Solution:

  • N=N0eλt

    Here, t=5 minutes N0e=N0.e5λ5λ=1,,λ=15,

    Now, T1/2=n2.λ=5n2



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