Question

If  the  electron  of  a  hydrogen  atom  is  present  in  the  first  orbit,  the  total
energy  of  the  electron  is
1)e2/r 2)e^2/r^2 3)e^2/2r 4)e^2/2r^2

Answer 1

It is option c)e^2/2r It is equal to the kinetic energy of the electron which is Ze^2/2r Z for hydrogen atom is 1 So answer is option (c) Hope it helps:)