In an atom, two electrons move round the nucleus in circular orbits of radii \( R \) and \( 4 R ...
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0In an atom, two electrons move round the nucleus in circular orbits of radii \( R \) and \( 4 R \), respectively, the ratio of time taken by them to complete \( 1 \mathrm{rev} \) is
(A) \( \frac{1}{4} \)
(B) 4
(C) 8
(D) \( \frac{1}{8} \)
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