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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 third Bohr’s orbit is

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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 third Bohr’s orbit is

(A) x/9 

(B) x/3

(C) 3x 

(D) 9x

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Correct Option  (B) x/3

Explanation:

According to Bohr’s model for hydrogen and hydrogen like atoms the velocity of an electron in an atom is quantised and is given by 

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