Question

How do you calculate the wavelength of electromagnetic waves?

Answer 1

Use the wave equation `v=f\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
`\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 xx 10^8 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.