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- The energy band gap between the cathode and anode is too small to generate photons of higher energy than far IR.
- Silicon is opaque to visible light (and even IR).
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The heat from an electric space heater is transferred to you by?
all objects emit electromagnetic radiation through empty space, as well as matter. So feel the heat from the electric heater due to radiation.
What is the difference between the charges on a balloon rubbed in your hair and a glass rod rubbed with silk why?
There is a very big difference between the electrical charge of a balloon rubbed in a person's hair and a glass rod rubbed with silk. The charge from the balloon will just make it stick to objects. The charge from the glass rod will emit a very large electrical shock that might knock a person to the ground. This is because the glass rod is a better conductor of electricity than the balloon.
How does plasma display work?
How a Plasma TV WorksPlasma TVs use small chambers of a plasma (gas) to illuminate adjacent areas of phosphors of different colors.Plasma TVs use thousands of sealed, low pressure glass chambers filled with a mixture of neon and xenon. Behind these chambers are colored phosphors, one red, one blue, and one green for each chamber. When energized, these chambers of "plasma" emit invisible UV light. The UV light strikes the red, green and blue phosphors on the back glass of the display making them produce visible light.
What is the principle of electric bulb?
The principle of an electric bulb( thee one with the filament ) is "RESISTANCE " it works just like a water immersion heater but at higher temperatures.. the filament inside the bulb offers high resistance to electricity or the electrons that try to pass, so due to high resistance proportionally high heat is produced (principle of immersion water heater), but how does it glow? have you seen how they make swords and metal items at a blacksmith the metal will actually glow red and then orange and turn to normal, and even sometimes molten hot metal look orange in colour, because, metals when overheated they emit light, and in our case of a electric bulb also the filament gets heated up and glows, and why use tungsten? why not any other metal? because tungsten has a melting point if about 3300 degrees celcius, that is way too high, so when the metal is heated to very high temperatures it does not break but emits light and also generates a lot of heat, that's why when you try to touch an incandescent bulb which has been burning for a long time it burns your fingers on contact, it will be hot, very hot. why do you think all over the world people are trying to get incandescent bulbs banned? it dissipates so much heat, 90% of electrical energy supplied to the bulb is turned into heat, that's why if you have a bulb lighting a closed fish tank the surface of the water feels warm!
How can you stop the weird radio station from playing on your computer?
If you have the computer case open, that can cause the computer to pick up and emit radio frequencies (RF). If the case is not open, try cleaning up all of your cables. Roll and tie them so they will stop acting like antennas. Also, make sure you are plugged into a grounded outlet. If the RF is strong enough, there isn't much you can do but move the computer further away from the signal or build a Faraday Cage (see link) around it. Some people can pick up RF with the fillings in their teeth.
Why ordinary silicon diodes do not emit light?
Silicon is opaque to all light (IR through UV).The bandgap of silicon is not high enough to produce visible photons, only IR photons.
How do you describe an electron that can emit light?
Light Emitting Diode
Why Silicon and germanium emit light?
they emit heat when their is a recombination of electron and holes
Does a pn junction diode emit light?
I don't think that the pn junction diode can emit light. Maybe it does, but a 'plastic' that covering the diode makes the light cannot be seen. Besides, you won't see it glow as it connect to the power source, right?
What is a ordinary diode?
A diode is an electronic component that will only allow current to flow through it in one direction. It is analogous to the valve in a bicycle tyre, which only lets air in but not out (except when you press the release tab). So if you connect a diode in a simple DC circuit one way around, the circuit will be closed and any devices on the circuit will work. If you connect it the other way around the circuit is open and no current will flow. I presume by 'ordinary diode' you mean a diode that is not a light emitting diode (LED). A LED is just a diode that emits light when current flows through it. Its purpose is to make light. A non-LED diode doesn't emit light. Its purpose is to allow current through a circuit in only one direction. A common use for ordinary diodes is in "rectifying circuits" which convert AC to DC.There are many other uses though.
What is a laser diode?
It's what makes the light !
Why silicon does not emit light?
I agree with Binitha on the point that Silicon is an indirect band gap semiconductor.
Why you use diode in electronics circuits?
You use a diode in a circuit to make sure that if the power was reversed it would not destroy the components, it can also be used to emit light. Its main use is that it is that positive energy can only enter from one side.
Do light bulbs emit light or suck dark?
Light bulbs emit light.
Are energy saving bulbs ultra violet light?
They may emit some energy in that wavelength, but most of their output is in the ordinary visible band.
Does technetium emit light?
Technetium doesn't emit light.
Do galaxies emit light?
Yes galaxies emit light
