The electron in a hydrogen atom makes a transition from an excited state the to ground state. Which of the following statements is true?

Options

A. Its kinetic energy increases and its potential and total energies decrease.
B. Its kinetic energy decreases, potential energy increases, and its total energy remains the same.
C. Its kinetic and total energies decrease and its potential energy increases
D. Its kinetic, potential, and total energy decreases.

Explanation

We know that the electron comes nearer to the nucleus, the potential energy decreases. So `(-KZ e ^(2))/(r )= ` PE and r decreases.
The KE will increase `[ K E = (1)/(2) |PE| = (1)/(2) (kZ E ^(2))/(r )]`
The total energy decreases . `[ TE = (1)/(2) (kZe ^(2))/( r )]`