2006-06-20 22:31:53 · 5 answers · asked by robin 3 in Science & Mathematics ➔ Physics
As electricity flows into certain atoms (which make up LEDs), energy is transferred to the electrons in the atoms. Those electrons absorb energy and rise to a higher excited state. At some later point in time, those electrons fall to a lower energy state. The difference in energy between the higher state and the lower state is emitted as a photon. The amount of energy in the photon determines the color.
2006-06-20 22:42:31 · answer #1 · answered by Tom 2 · 0⤊ 1⤋
It is a form of electroluminescence created from an electrical current passing through a given chemical semiconductor. The color of the light is determined by the chemical composition of the semiconductor: gallium arsenide for infrared, gallium nitride for blue, aluminum gallium phosphide for green, aluminum gallium indium phosphide for high-brightness LEDs from orange through green, etc.
If you wish to be even more technical: An LED is a semiconductor diode which was created by doping a semiconductor to create a p-n junction. When an electron meets an "electron hole", or the absense of an electron from a valence band, at this junction, it transitions to a lower energy level and releases the extra energy in the form of a photon. The wavelength of the emitted photon depends upon the energy difference between the top of the valence band and the bottom of the conduction band of the semiconductor, which varies by the semiconducting material.
2006-06-20 22:34:56 · answer #2 · answered by stellarfirefly 3 · 0⤊ 0⤋
L.E.D. means LIGHT EMMITING DIODE. it works on the principal of resistence. When electricity passes through this diode having a transparent cover , the mechanism or in other words the filament made of higher resisting material convert the energy into photon, depending upon the material of the conductur , the light produces.
2006-06-20 23:15:21 · answer #3 · answered by bunty_tibrewal 2 · 0⤊ 0⤋
sure - the microphone is a diaphragm gadget, the place a compression wave (created by making use of sound) hits the diaphragm linked to a movable magnet interior of a coiled cord. it truly works on the comparable concepts as a dynamo, a tiny cutting-edge is produced and is surpassed to an amplifier the place it truly is amplified to permit you to pay attention it. in case you have a vinyl checklist - the exterior is basically a single groove alongside which a needle passes arising vibrations and (making use of the comparable theory with the aid of fact the microphone) as quickly as amplified - arising sound [that's an occasion of analog storage medium] Sound could be recorded right into a working laptop or pc (with the aid of a microphone) and with the aid of a technique of digital sampling - a digitised sign could be saved the two interior the pc's reminiscence or on a disk [CD or DVD] look up ADC (analogue to digital conversion) and DAC (digital to analog conversion) on Google - there must be particularly some technical stuff there appropriate to the point of your undertaking. desire this helps
2016-10-31 05:41:14 · answer #4 · answered by Anonymous · 0⤊ 0⤋
LED createes resistance witch make molecules move faster as the move fast they creat friction that produces light when energy is applied
2006-06-20 22:38:17 · answer #5 · answered by cahaba valley energy saving s 1 · 0⤊ 0⤋