NEET Physics Nuclei Questions Solved


The ratio of the speed of the electrons in the ground state of hydrogen to the speed of light in vacuum is

(a) 1/2                (b) 2/137
(c) 1/137            (d) 1/237

(c) Speed of electron in nth orbit of hydrogen atom

v=e22ε0nh

In ground state n =1 v=e22ε0h

vc=e22ε0ch=1.6×10-1922×8.85××10-12×3×108×6.6××10-34

=1137

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