In an atom, two electrons move around the nucleus in circular orbits of radii \( \mathrm{R} \) a...

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In an atom, two electrons move around the nucleus in circular orbits of radii \( \mathrm{R} \) and \( 4 \mathrm{R} \). The ratio of the time taken by them to complete one revolution is:
(a) \( 1: 4 \)
(b) \( 4: 1 \)
(c) \( 1: 8 \)
(d) \( 8: 7 \)
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