Final answer:
Humans mainly emit electromagnetic radiation in the infrared (IR) spectrum, with our body temperatures determining our peak emission according to Wien's law. The spectrum of electromagnetic radiation is broad, ranging from low-energy radio waves to high-energy gamma rays.
Step-by-step explanation:
Humans emit electromagnetic radiation primarily in the infrared (IR) part of the spectrum. At typical human body temperatures, the peak emission of radiation falls within the infrared region, according to Wien's law. The IR radiation we emit is not visible to the human eye but can be detected with thermal imaging equipment, which capitalizes on this invisible radiation to create images based on temperature differences. Moreover, the amount of energy emitted by an individual photon is related to its wavelength, with shorter wavelengths corresponding to more energetic photons. Thus, the spectrum of electromagnetic radiation is continuous and ranges from low-energy radio waves to high-energy gamma rays.
When ranking the regions of the electromagnetic spectrum by the energy provided per photon, the correct order follows the frequency of the waves: radio, microwave, infrared, visible, ultraviolet, X-ray, gamma. It is essential to remember that as a physiological property, our emission primarily in IR is due to the relatively low temperatures of our bodies compared with other phenomena in the universe that might emit in different parts of the spectrum.