# Microwaves travel at the speed of light, #3.00 times 10^8# #m##/##s#. When the frequency of microwaves is #9.00 times 10^9# #Hz#, what is their wavelength?

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We're given a wave's speed and its frequency, and we're asked to calculate its wavelength.

The wavelength-frequency relationship of a periodic wave is represented by the equation

where

*lambda*) is the wavelength of the wave, in

Since we're trying to find the wavelength, let's rearrange this equation to solve for wavelength,

Plugging in our known variables, we have

(You don't need to use the exact value for

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