The enregy, radius and velocity of the electron in the hydrogen atom in the ground state are `-13.6 eV, 0.53 Å` and `2.188 xx 10^(8) m s^(-1)` respectively.
Which shell of `He^(+)` ion will have the same energy

Options

A. 1st
B. 2nd
C. 3rd
D. 4th

Answer

B

Explanation

For hydrogen like particle,
`upsilon_(n)=(Zxx2.188xx10^(8) ms^(-1))/n`
`=2.188xx10^(8) cms^(-1)` (given )
`:.` for `He^(+) (Z=2), 2/n=1` or n=2