sunlight contains___and___enery
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The solar energy reaching Earth's surface includes visible light, ultraviolet and infrared radiation. Ultraviolet light is high energy and causes damage including sunburn, fading of pigments and degradation of compounds such as fabrics, plastic and rubber. Ultraviolet radiation can also be used to kill harmful bacteria and parasites in water, rendering it safe for drinking.
Infrared radiation is felt as heat, and is given off by all objects. If your body is warmer than surrounding objects, your body gives up more radiant heat than it receives from the surroundings, and you will feel cool or cold. If nearby objects are warmer, such as a heat lamp or space heater, you receive more radiant heat on that side of your body than your body gives off, and you will feel warm on that side. The other side may feel quite cold, however.
Much of the energy from the Sun arrives on Earth in the form of infrared radiation. Sunlight in space at the top of Earth's atmosphere at a power of 1366 watts/m2 is composed (by total energy) of about 50% infrared light, 40% visible light, and 10% ultraviolet light[1]. At ground level, this decreases to about 1120-1000 watts/m2, and consists of 44% visible light, 3% ultraviolet (with the Sun at the zenith (directly overhead), but less at other angles), and the remainder infrared. Thus, sunlight's composition at ground level, per square meter, with the sun at the zenith, is about 527 watts of infrared radiation, 445 watts of visible light, and 32 watts of ultraviolet radiation. The balance between absorbed and emitted infrared radiation has a critical effect on the Earth's climate.
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