Question

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

Answer 1

Correct Answer - A
`V=2.188xx10^(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)`