3) Describe briefly on LED's ?
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A light-emitting diode ,LED is a semiconductor device that emits visible light when an electric current passes through it. The light is not particularly bright but in most LED it is monochromatic, occurring at a single wavelength
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LED are the types of Television. it is one of the two types of TV.
- CRT
- LED
it is the latest and updated version of television.
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