Thread: electromagnetic waves

An electromagnetic wave has a wavelength of 4.62E-7 m and a speed of 2.54E+8 m/s in a particular material. What is the frequency (in Hz) of this wave in the material?
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Find the wavelength (in m) of this wave in vacuum.

First, we need a formula, it turns out that the relationship is this:



Where is the velocity of the wave and is the wavelength.

So we just plug and chug:



If you work it all out, you should get: