The velocity of an electron in the first orbit of `H` atom is `v` . The velocity of an electron in the second orbit of `He^(+)` isA. `2 v`B. vC. `(v)/(2)`D. `(v)/(4)`

The velocity of an electron in the first orbit of `H` atom is `v` . Th

1.	The velocity of an electron in the first orbit of `H` atom is `v` . The velocity of an electron in the second orbit of `He^(+)` isA. `2 v`B. vC. `(v)/(2)`D. `(v)/(4)`
Answer» Correct Answer - B `v_(n) = alpha ((eZ)/(n))` , were `alpha = (e^(2))/(2 h epsilon_(0)c)` is the constant `(alpha = (1)/(137))` `v_(He) = alpha (c(2))/(2) = alpha c` and `v_(H) = alpha (c(1))/(1) = alpha c = v_(He^+)`

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