Atoms And Nuclei Question 381

Question: Average life of a radioactive sample is 4ms. Initially the total number of nuclei is N0 . A charged capacitor of capacity 20μF is connected across a resistor R. The value of R such that ratio of number of nuclei remaining to charge on capacitor remains constant with time is

Options:

A) 100 Ω

B) 200 Ω

C) 300 Ω

D) 400 Ω

Show Answer

Answer:

Correct Answer: B

Solution:

  • N=N0eλtq=q0et/RC and Nq= constant when eλt=et/RCλ=1RC,R=200Ω .


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