NEET UG PHYSICS MCQ: NUCLEI

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Analyzing +4 | -1

A radioactive sample decays with an average-life of

20 \mathrm{~ms}

. A capacitor of capacitance

100 \mu \mathrm{F}

is charged to some potential and then the plates are connected through a resistance

R

. What should be the value of

R / 40

so that the ratio of the charge on the capacitor to the activity of the radioactive sample remains constant in time?

View answer and explanation

Correct option: A

Option A (Moderator) is correct because heavy water is used to slow down neutrons in a nuclear reactor, acting as a moderator.

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\left({ }_{92}^{235} \mathrm{U}\right)

1\,\,a.m.u = 931\,\,MeV