The binding energy of a H-atom considering an electron moving around a fixed nuclei (proton), is
`B = - (me^(4))/(8n^(2)epsi_(0)^(2)h^(2))` (m= electron mass)
If one decides to work in a frame of refrence where the electron is at rest, the proton would be movig around it. By similar arguments, the binding energy would be :
`B = - (me^(4))/(8n^(2)epsi_(0)^(2)h^(2))` (M = proton mass)
This last expression is not correct, because

Answer

`C`

Explanation

when one decide to work in a frames of reference where the electron is at rest, the given expression is n to true as it forms the non-inertial frame of refrence.