# How do you calculate the frequency?

Count the number of events occurring during a time period. Then frequency = number of events/length of time period.

### How do you calculate the frequency of light emitted in chemicals?

There are several ways to calculate the frequency of light emitted or absorbed by different chemicals, and they depend on what you already know. For example, if you know the energy of the particle, then you can calculate frequency from E = planck's constant x frequency and solve for frequency. If you happen to know the wavelength, then you can use C = wavelength x frequency and solve for frequency (where C = speed of…