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Far infrared is a region in the infrared spectrum of electromagnetic radiation. Far infrared is often defined as any radiation with a wavelength of 15 micrometers to 1 mm, which places far infrared radiation within the CIE IR-B and IR-C bands.
https://en.wikipedia.org/wiki/Far_infrared

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he range of wavelengths or frequencies over which electromagnetic radiation extends.
https://www.google.com/search?q=electromagnetic+spectrum&rlz=1CASMAI_enUS728US728&oq=electromagnetic+spectrum&aqs=chrome..69i57j0l5.626j0j7&sourceid=chrome&ie=UTF-8&safe=active&ssui=on

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gamma rays https://www.google.com/search?q=gamma+radiation&rlz=1CASMAI_enUS728US728&oq=gamma+radiation&aqs=chrome..69i57j0l5.730j0j7&sourceid=chrome&ie=UTF-8&safe=active&ssui=on

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Infrared radiation is a type of electromagnetic radiation, as are radio waves, ultraviolet radiation, X-rays and microwaves. Infrared (IR) light is the part of the EM spectrum that people encounter most in everyday life, although much of it goes unnoticed. It is invisible to human eyes, but people can feel it as heat. https://www.livescience.com/50260-infrared-radiation.html