What color of the electromagnetic spectrum has the lowest frequency?

Answer 1

The "Balmer Series" includes the visible spectrum of light from hydrogen ... four

wavelengths, 410 nm, 434 nm, 486 nm, and 656 nm, that correspond to emissions

of photons by electrons in excited states transitioning to the quantum level described

by the principal quantum number n equals 2. (There are also a number of ultraviolet

Balmer lines with wavelengths shorter than 400 nm.)

Of the four visible Balmer lines, the one with the longest wavelength ... 656 nm ...

is the one with the lowest energy per photon. It appears quite red.

Answer 2

Radio waves have the lowest frequency in the electromagnetic spectrum. Are you asking which color has the lowest frequency in visible light?

Answer 3

It's the last color you can see at the red end of the spectrum.

Answer 4

The lowest frequency of visible light produces the last color

you can see on the red end of the rainbow.

Answer 5

Violet