Calculate the frequency of the n = 2 line in the Lyman series of hydrogen.

Layman series describe the ultraviolet emission lines that the hydrogen atom emits when an electron is moved from a higher energy level to level 1.

For n = 2

The wavelength = 121.5 nm

velocity = wavelength * frequency

frequency = velocity / wavelength

frequency = (3 * 10^8) / (121.5 * 10^9) = 2.469 * 10^15 Hz