In its widest sense the term includes electromagnetic, acoustic, and particle radiation, and all forms of ionizing radiation. According to the quantum theory , the energy carried in the form of electromagnetic radiation may be viewed as made up of tiny bundles or packets, each bundle being known as a photon . The sun is the source of much radiant energy in the form of sunlight and heat.
Heat radiation is infrared radiation .
All types of electromagnetic radiation can be reflected and absorbed in the same manner as is visible light. The Van Allen radiation belts consist of charged particles trapped in the earth's magnetic field. Get quality answers at the right price. Listing from Electric Library , a pay service. Copyright 2001 Infonautics Corporation .