# How do you calculate the wavelength of electromagnetic waves?

Mar 30, 2018

Use the wave equation $v = f \setminus \lambda$

#### 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
$\setminus \lambda$ is the wavelength

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 $2.99 \times {10}^{8} \frac{m}{s}$

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.