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| radiation consisting of electromagnetic waves, including radio waves, infrared, visible light, ultraviolet, x-rays, and gamma rays |
| the acceleration of a falling body in the earth's gravitational field, inversely proportional to the square of the distance from the body to the center of the earth |
photodisintegration
in physics, nuclear reaction in which the absorption of high-energy electromagnetic radiation (a gamma-ray photon) causes the absorbing nucleus to change to another species by ejecting a subatomic particle, such as a proton, neutron, or alpha particle. For example, magnesium-25, upon absorbing a photon of sufficient energy, emits a proton and becomes sodium-24. Photodisintegration differs from the nuclear reaction photofission, in which a nucleus, upon absorbing a photon, splits into two fragments of nearly equal mass
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