Question

What units of measurement are used to describe wavelengths?

Answer 1

Metre

Explanation:

Wavelength is defined as the length of one whole oscillation or wave cycle.

Note how this is a length. This means we used our standard units for length, which are metres (m).

In reality, we might use slightly different units based on the type of wave we're talking about. For visible light, we might use nanometres (`10^-9"m"`) - but this still comes back to metres for calculations.