According to Bahor's theory of hydrogen atom the product of the binding energy of the electron in the nth orbit and its radius in the nth ornit.

Options

A. is proportional to `n^(2)`
B. is inversely proportional to `n^(3)`
C. has a consatnt valueof `10.2 eV-Å`
D. has a consatnt valueof `7.2 eV-Å`

Answer

D

Explanation

`E_(n) prop (1)/(n^(2))` and `r_(n) prop n^(2)`
Therefoe, `E_(n) r_(n)` is independent of `n` .
Hence, `E_(n) r_(n) = (13.6 eV) (0.53 Å)`
`= 7.2 eV - Å`
`= constant`