Which type of wave has the lowest frequency in the electromagnetic spectrum?

Radio waves have the lowest frequency in the electromagnetic spectrum. The electromagnetic spectrum encompasses a wide range of wave types, each characterized by different frequencies and wavelengths.

Frequencies in the electromagnetic spectrum increase from radio waves through microwaves, infrared, visible light, ultraviolet, X-rays, to gamma rays. Since frequency is inversely related to wavelength, radio waves, with their longer wavelengths, correspond to the lowest frequencies in this spectrum. This characteristic allows radio waves to be used effectively in communication technologies, such as broadcasting and wireless transmissions.

In contrast, gamma rays have extremely high frequencies, followed by X-rays and visible light, which all have significantly higher frequencies than those of radio waves. Thus, radio waves are distinctly identified as having the lowest frequency within the electromagnetic spectrum.