the answer to that would have to be infared
The part of the electromagnetic spectrum with the lowest frequency and longest wavelength is radio waves. They are used for communication, broadcasting, and radar.
Red light.
red, chutiye
The longest wavelength of light that a human eye can perceive depends on the individual, but is generally in the neighborhood of 750 nanometers (7.5 x 10-7 m). Light with that wavelength is perceived by the retina/brain system as colored red.
red,orange,yellow,green,blue,indigo,violet
There is no longest wavelength for photons. It can be arbitrarily long.
"radio waves" have longest wavelength..
-- longest wavelength -- lowest frequency
Red light has the longest wavelength.
The longest visible wavelength of light appears red. "Longest wavelength" is equivalent to 'lowest frequency'.
Red is the longest wavelength of visible light
Radio waves have the longest wavelength in the electromagnetic spectrum.