Final answer:
Radiation in the radio wave region of the electromagnetic spectrum is invisible to the human eye and has the lowest energy. The energy of photons in the electromagnetic spectrum ranges from lowest in radio to highest in gamma rays. Compton scattering used X-rays, a high-energy form of electromagnetic radiation.
Step-by-step explanation:
The region of the electromagnetic spectrum where you would find radiation that is invisible to the human eye and has low energy is the radio wave region. Radio waves have the longest wavelengths and the lowest frequencies, which corresponds to having the lowest energy in the electromagnetic spectrum.
They are widely used in media broadcasts for TV and radio signals. The correct ordering of the regions of the electromagnetic spectrum by the amount of energy per photon, from lowest to highest, is: radio, microwave, infrared, visible, ultraviolet, X-ray, gamma. Therefore, the correct ranking is option a.
In Compton scattering, the type of electromagnetic radiation that was used is X-rays. This phenomenon demonstrates the particle-like properties of electromagnetic radiation where X-rays scatter off electrons, transferring energy and momentum to them.
Concerning the position of radio waves on the electromagnetic spectrum, they fall on the low-frequency side of visible light, which is option d in the GRASP CHECK question.