Which waves have a lower frequency radar waves or visible light waves?



Answer:
Radar is much lower frequency than visible light.

Radar is a few megahertz to about a hundred gigahertz, depending on the application.

Visible light is in the hundreds of terahertz.
Radar
visible spectrum = 380nm~760nm
radar = 100m~2.7mm

As you can see the radar (radio) waves are must longer (lower frequency) than the visible light spectrum.

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