If the speed of electron in the Bohr's first orbit of hydrogen atom is \( x \), the speed of the...

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If the speed of electron in the Bohr's first orbit of hydrogen atom is \( x \), the speed of the electron in the Bohr's third orbit is:
(A) \( x / 9 \)
(B) \( x / 3 \)
(C) \( 3 x \)
(D) \( 9 x \)
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