Ahydrogen atom initially in the n 3 level emits a photon and ends up in the ground state. (a) what is the energy of the emitted photon?

The energy levels of the hydrogen atom are given by

where n is the level number.

For n=3 we have

while for n=1 (ground state) we have


The energy of the emitted photon is equal to the energy difference between the two levels in the transition from n=3 to n=1:


In joule, this corresponds to

Aform of energy that is reflected or emitted from objects in the form of electrical and magnetic waves that can travel through space. there are many forms of  electromagnetic  energy including gamma rays, x rays, ultraviolet radiation, visible light, infrared radiation, microwaves and radio waves.