The figure below depicts the first four energy levels in a hydrogen atom. (Enter an unrounded answer.)

Three transitions shown as arrows, n=2 --> n=1 , n=3 --> n=1 , and n=4--> n=1, emit ultraviolet light and occur at wavelengths of , 121.566 nm , 102.583nm and 97.524 nm , respectively. Find the frequency of light (in ) that would be emitted in a transition from the state labeled as n=4 to the state labeled as n=2 .