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Hot charcoal may not give off light but it does emit infrared radiation which we feel as heat

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Q#1  what are electromagnetic spectrum

Q#2 how do scientist gather the ems information

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When an object is not quite hot enough to radiate visible light, it will emit most of its energy in the infrared 

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When an object is not quite hot enough to radiate visible light, it will emit most of its energy in the infrared 

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sentence # 1 the electromagnetic spectrum is a range  of all types of electromagnetic radiation

1. sentence # 2 the ems is used to gather information about component in the universe by analyzing  the spectrum of  visible light from objects  in the universe

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They are used for many task, for example, remote controls for TVs and video recorders, and physiotherapistis use heat lamps to help heal support injuries. IR is also used for short range communications, for example between mobile phones, or for the Dolby Screentalk headset system used in some cinemas.

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Infrared Radiation or simply Infrared is electromagnetic radiation with longer wavelenghts than those of visible light, and is therefore invisible, although it is sometimes it is loosely called Infrared Light.

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Wavelength-700 (NM) Nanometers to 1 (MM) Millimeters