The energy of an electron in the 3rd orbit of an atom is `-E`. The energy of an electron in the first orbit will be

Options

A. `-3E`
B. `-E//3`
C. `-E//9`
D. `-9E`

Answer

D

Explanation

`E_(n) prop (1)/(n^(2))` now `E_(3) = (E_(1))/(3^(2))`
Now `E_(3) = -E :. E_(1) =-9E`
`because E_(3) = -E xx 3^(2) = -9 E`