If the energy of a hydrogen atom in `n^(th)` orbit is `E_n` then energy in the nth orbit of a singly ionized helium atom will

Options

A. `4E_n`
B. `E_n/4`
C. `2E_n`
D. `E_n//2`

Answer

A

Explanation

`E_nprop Z^2 :. (E_(He^(+)))/(E_H)=((2)^2)/((1)^2)=4`
`E_(He^(+))= 4E_H=4E_n " "(E_H=E_n)`