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The speed of an electron in the innermost orbit of the hydrogen atom (Bohr radius = 52.9 pm, me=9.11×1031kg is

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a
2.19×104ms1
b
2.19×106ms1
c
2.19×107ms1
d
2.19×108ms1

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detailed solution

Correct option is B

The required speed is

v=2πhe24πε0 =2(3.14)6.626×1034Js1.602×1019C21.112×1010C2N1m2 =2.19×106ms1

The option B is correct.

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