That would be sound waves, or the audio spectrum.
The radio band is the least energetic section of the electromagnetic spectrum.
Gamma rays have frequencies higher than x-rays in the electromagnetic spectrum. They have the shortest wavelengths and highest energies in the spectrum.
Photons with higher energy correspond to electromagnetic radiation with higher frequency/shorter wavelength. In the visible band, the color with the highest frequency is the last one you can see on the VIOLET end of the spectrum.
The color spectrum in order of increasing frequency (that also means decreasing band width) is red, orange, yellow, green, blue, violet. So red is the lowest visible frequency. Below that is called infrared and the color with a frequency greater than violet is called ultraviolet. Neither infrared nor ultraviolet is visible to the human eye although there may be other animals that are able to detect them.
Perhaps you are after the word band or bandwidth.
The lowest frequency is effectively zero and this would be in the extremely low frequency (ELF) band in the sub-radio range of the electromagnetic spectrum.
Radio waves have a lower frequency than microwaves in the electromagnetic spectrum. They have the lowest frequency and longest wavelengths of all the electromagnetic waves.
The band of the electromagnetic spectrum with the highest frequency is gamma rays. Gamma rays have the shortest wavelengths and highest energy levels among all electromagnetic waves.
That's the portion of the spectrum that we call "gamma rays".
The radio band is the least energetic section of the electromagnetic spectrum.
Gamma rays have frequencies higher than x-rays in the electromagnetic spectrum. They have the shortest wavelengths and highest energies in the spectrum.
The visible spectrum is one band within the full range of electromagnetic radiation.
Infrared waves are located between microwaves and visible light on the electromagnetic spectrum. They have longer wavelengths and lower frequencies than visible light, making them invisible to the human eye but detectable as heat.
The band of the electromagnetic spectrum that has a wavelength between infrared and ultraviolet is the visible light spectrum. This is the portion of the electromagnetic spectrum that is visible to the human eye and includes colors such as red, green, and blue.
Visible light is the electromagnetic wave that falls within a small band of the broad electromagnetic spectrum. It is the only portion of the electromagnetic spectrum that is visible to the human eye.
Photons with higher energy correspond to electromagnetic radiation with higher frequency/shorter wavelength. In the visible band, the color with the highest frequency is the last one you can see on the VIOLET end of the spectrum.
the lowest frequency Lester was here