If the velocity of an electron in the first Bohr orbit of a hydrogen atom is \( \mathrm{V} \), t...

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If the velocity of an electron in the first Bohr orbit of a hydrogen atom is \( \mathrm{V} \), then its velocity in the third Bohr orbit will be:
(a) \( \mathrm{V} / 9 \)
(b) \( \mathrm{V} / 3 \)
(c) \( 9 \mathrm{~V} \)
(d) \( 3 \mathrm{~V} \)
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