Energy of a photon is given as:

The given table lists the photon energies for different parts of an electromagnetic spectrum for differentλ.
λ
(m) |
103 |
1 |
10-3 |
10-6 |
10-8 |
10-10 |
10-12 |
E
(eV) |
12.375 ×
10−10 |
12.375 ×
10−7 |
12.375 ×
10−4 |
12.375 ×
10−1 |
12.375 ×
101 |
12.375 ×
103 |
12.375 ×
105 |
The photon energies for the different parts of the spectrum of a source indicate the spacing of the relevant energy levels of the source.