types of radiation waves
In physics, radiation is the emission or transmission of energy in the form of waves or particles through space or through a material medium. This includes: 1  electro-magnetic radiation (also known as continuum radiation) Î³ such as radio waves, visible light, and x-rays.
The lower-energy, longer-wavelength part of the spectrum including visible light, infrared light, microwaves, and radio waves is non-ionizing; its main effect when interacting with tissue is heating. This type of radiation only damages cells if the intensity is high enough to cause excessive heating.