# How do you calculate the wavelength of electromagnetic waves?

##### 1 Answer

Mar 30, 2018

Use the wave equation

#### Explanation:

This is a very important equation in physics and works for all types of waves, not just electromagnetic ones. It works for sound waves too, for example.

*v* is the velocity

*f* is the frequency

Now, when we're working with the electromagnetic spectrum, velocity *v* is always the speed of light. The speed of light is denoted *c* and is approximately

So, whenever we're working with the electromagnetic spectrum, you can easily determine frequency given wavelength or wavelength given frequency because the velocity is constant.