# Speed of light

The speed of light is related to the frequency and the wavelength as described in the following equation:

**c=λf**

where c is the speed of light (measured in meters per second), f is the frequency of the light in hertz (Hz), and λ is the wavelength of the light measured in meters. This equation is also valid for other types of electromagnetic waves.

It follows from this equation that an increase in frequency results in a decrease in the wavelength of light. The photons that make up the light also have higher energy at higher frequencies.