Consider the energy levels for Hydrogen in the table below: (note the energy is relative to the energy necessary for an electron to escape. So for Level n = 1 the electron would need to gain 13.6 electron volts to no longer be negative and thus able to escape the atom!) Level (n = ) Energy (in eV)
1 -13.6
2 -3.40
3 -1.51
4 -0.850
5 -.544
6 -.378
What would be the energy of a photon emitted when an electron drops from the n=3 to n=2 level in a Hydrogen atom.

E = eV

The equation for the energy of a photon is where is known as the Planck constant and is equal to eV s.

Since we know that for light we can rewrite the equation for the energy of a photon as

What then is the frequency of the photon from your answer above?

=

Hz

What region of the electromagnetic spectrum does this correspond to?