That would be sound waves, or the audio spectrum.
Radio
Gamma rays
The radio band is the least energetic section of the electromagnetic 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.
Gheresi
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.
gamma radiations..
That's the portion of the spectrum that we call "gamma rays".
UHF (Ultra High Frequency)
Gamma rays
The radio band is the least energetic section of the electromagnetic spectrum.
Immediately adjacent to the band of visible light, on the end with highest frequency / shortest wavelength.
color
The visible spectrum is one band within the full range of electromagnetic radiation.
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.
That would be a spectrum or band.
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.