If the energy of a hydrogen atom in `nth` orbit is `E_(n)`, then energy in the nth orbit of a singly ionised helium atom will be

Options

A. `4E_(n)`
B. `E_(n)//4`
C. `2E_(n)`
D. `E_(n)//2`

Answer

A

Explanation

`E_(n) prop Z^(2)`
for ionized helium Z = 2
`therefore (E_(n))_(He)= 4 xx (E_(n))_(H)`