We are continuously bombarded by radiation from both natural and artificial sources. We are exposed to infrared, ultraviolet, and visible radiation from the Sun; radio waves from radio and television stations; microwaves from microwave ovens; X-rays from medical procedures; and radioactivity from natural materials. Understanding the different energies of these various kinds of radiation is necessary in order to understand their different effects on matter. Compare the damaging and therapeutic effects of radiation.
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