How many times is the velocity of the electron in the first shell of He^(+) ion as compared to that in the first shell of hydrogen atom ?

How many times is the velocity of the electron in the first shell of H

1.	How many times is the velocity of the electron in the first shell of He^(+) ion as compared to that in the first shell of hydrogen atom ?
Answer» Solution :`v_(n) = v_(0) Z//n`. For H, Z = 1 and for 1st SHELL, n = 1 Hence, `v_(1) = v_(0)` For `He^(+), Z = 2` and for 1st shell, n = 1. Hence `v_(1) = 2v_(0)`