Question

If velocity of an electron in 1st orbit of H atoms is V , what will be the velocity in 3rd orbit of `Li^(2+)` ?
A. V
B. V/3
C. 3 V
D. 9 V

Answer 1

Correct Answer - A
(a) `V = 2.188 xx 10^6 (Z)/(n) m//s`
Now, `V prop (Z)/(n)`
so, `(V_(Li^(2 +)))/(V_H) = -(Z_1//n_1)/(Z_2//n_2) = (3//3)/(1//1) = 1`
or, `V_(Li^(2 +)) = V H`.