अब्दुल वॉइस टेस्टिंग द कंडक्टिविटी ऑफ फ्यू मैटेरियल्स एंड कैप्टन डिफरेंट मैटेरियल्स इन द गेट ए बी इन व्हिच गैस इज द बल्ब लाइट 24:00 बजे व्हाट्सएप
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Light-emitting diodes (LEDs)—small colored lights available in any electronics store—are ubiquitous in modern society. They are the indicator lights on our stereos, automobile dashboards, and microwave ovens. Numeric displays on clock radios, digital watches, and calculators are composed of bars of LEDs. LEDs also find applications in telecommunications for short range optical signal transmission such as TV remote controls. They have even found their way into jewelry and clothing—witness sun visors with a series of blinking colored lights adorning the brim. The inventors of the LED had no idea of the revolutionary item they were creating. They were trying to make lasers, but on the way they discovered a substitute for
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