A radioactive sample decays with an average life of 20 ms. A capacitor – InterviewSolution

1.	A radioactive sample decays with an average life of 20 ms. A capacitor of 100 μF is charged to some potential and then the plates are connected through a resistance R . What should be the value of '20×R' (in kΩ), so that the ratio of the charge on the capacitor to the activity of the radioactive sample remains constant in time ?
Answer» A radioactive sample decays with an average life of $20 m s$ . A capacitor of $100 μ F$ is charged to some potential and then the plates are connected through a resistance $R$ . What should be the value of ' $20 \times R$ ' (in $k Ω$ ), so that the ratio of the charge on the capacitor to the activity of the radioactive sample remains constant in time ?

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