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Consider 3rd orbit of He+ (Helium), using non-relativistic approach, the speed of electron in this orbit will be [given K = 9 109 constant, Z = 2 and h (Planck's Constant) = 6.6 10-34 J s]
(4) 1.46 106 m/s
v = 2 K Z e2nh
= 2 3.14 9 109 2 (1.6 10-19)23 6.6 10-34
= 2.89 10-271.98 10-33
1.46 106 m/s
Answer: (4)
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