Derivation of the Formula lambda l refers to the wavelength the distance between the crests in meters m v refers to the velocity of the speed of waves are moving in a direction in meter per seconds ms f refers to the frequency the wave crests that go through a point in certain time cycles per second or hertz cycless or Hz.
The formula for calculating wavelength is. L is the wavelength. R Rydberg Constant 10974x10 7 m-1. L Cf Where l Lambda Wavelength in meters.