Which electromagnetic wave has the longest wavelength?

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Multiple Choice

Which electromagnetic wave has the longest wavelength?

Explanation:
Longer wavelengths correspond to lower frequencies on the electromagnetic spectrum. Among the options, radio waves sit at the far end with wavelengths from about a millimeter up to thousands of kilometers, making them the longest. X-rays and gamma rays have very short wavelengths (high energies), while infrared lies between visible light and microwaves with shorter wavelengths than radio waves. So radio waves have the longest wavelength.

Longer wavelengths correspond to lower frequencies on the electromagnetic spectrum. Among the options, radio waves sit at the far end with wavelengths from about a millimeter up to thousands of kilometers, making them the longest. X-rays and gamma rays have very short wavelengths (high energies), while infrared lies between visible light and microwaves with shorter wavelengths than radio waves. So radio waves have the longest wavelength.

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