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Velocity of the electron in the 1st Bohr orbit

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21.8×10⁸ cm/sec

2.18×10⁶ m/sec

2.18×10⁶ cm/sec

36559×10⁸ cm/sec

answer is B.

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Detailed Solution

Velocity of an electron in nth Bohr orbit = v_n=2.165 $\times$ 10⁶ $\frac{Z}{n} m s^{- 1}$
First Bohr orbit (n= 1)so Velocity of an electron in1^st Bohr orbit = v=2.165 $\times$ 10⁶ ${ms}^{- 1}$

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