ive asked this question many times but no one culd clear it for me. plz help?

Question

i wanted to kno dat is it d gas in the bulb or d filament in d bulb dat produces colour??n which filament n gas is used in white bulbs dat we use in homes??????????

Answer 1

It depends on the bulb. In incandesent lights (the real old models), it is the filament itself, since there is either no gas in the bulb, or the gas is inert, prolonging the bulb's life.

Neon lights do not have a filament. Their light is due to the electrified gas inside. Despite the name, few neon lights have neon in. Some have other gases to create other colors of light (Neon produces only a deep red). An electric field inside the tube energizes atoms, and the atoms soon release the extra energy as light.

The white lights used in homes (fluorescent lights) work basicaly like neon lights, but instead of giving off visible light, it emit a certain frequency of ultraviolet radiation. which then strikes a coating inside the tube that absorbs the UV, and then releases white light in the process.

Answer 2

What... are you hooked on phonics? Try asking your question in a more readable format.

It's the filament and sometimes a coating on the inside of the bulb. Tungsten is a common metal used for filaments but others use cheaper metals. Most of the bulbs in your home are white light bulbs and come from a coating on the inside of the bulb. If the bulb is clear, the light is the color of the filament. Most bulbs are either filled with an inert gas(noble gas) or from a vacuum. A vacuum requires a thicker bulb so most are inert gas filled.

Answer 3

In fluorescent bulbs, the gas can make a difference. Think of the coloured tubes of light that make sign like the "open" signs at restaurants. Those are filled with different gasses which make them different colours. Filamental bulbs are mostly vacuums with little gas inside. Tungsten filaments are most common, and since they irradiate a large spectrum, the colour appears white. However, if there is a little bit of sodium present, the glow will appear yellow.

Answer 4

It is the gas if you're talking about neon bulbs. In a white light bulb with a filament, there is no gas inside because it's a vacuum. In that case, the color comes from a combination of the glowing tungstan filament and the white coating used to coat the inside of the bulb.

Somehow I think I was suckered into answering this one! >grins<

Answer 5

Generally, the original light bulb (http://encyclopedia.thefreedictionary.com/incandescent+light+bulb) was basically an electric current run through a metal filament in a near vacuum. This is still how many light bulbs are made today.

However, alternate lighting modalities have been invented.

Fluorescent lights (long tubes with a gas that fluoresces when electric current is run through it) were invented quite a while back, but were inconsistent. They often flickered or oscillated at frequencies that caused headaches, and sometimes hummed noticeably. Recent improvement have eliminated much of the flicker, and noise issues.

Compact fluorescent lightbulbs (http://encyclopedia.thefreedictionary.com/fluorescent+lamp) use the same technology as regular fluorescents, but use small snaking tubes of gas to produce a similar amount of light out of a space more equivalent to a standard filamented lightbulb. The amount of current and specific gases used will affect the wavelengths of light emitted from the compact fluorescent bulbs. Fluorescents are not generally advisable to use with dimmer switches, as it may damage the bulb and make it inoperable. Compact fluorescents do have the added benefit of running slightly cooler, and cosuming less power than standard filamented bulbs, but may produce less light or take longer to "warm up" to full light producing capacity.

Neon lights (http://encyclopedia.thefreedictionary.com/neon+lamp) work on much the same principle as fluorescent lights, except that they utilize different gases to achieve emission of different colors of light from the tube, rather than standard "white" light.

Halogen bulbs use a slightly different technique than standard filamentary bulbs to achieve their lighting effects. From http://encyclopedia.thefreedictionary.com/incandescent+light+bulb "The problem of short bulb life is addressed in the halogen lamp which is filled with a halogen gas such as iodine or bromine. This creates an equilibrium reaction where evaporated filament is chemically re-deposited at the hot-spots, preventing the early failure of the lamp." IE, the filaments last longer, and can be run hotter and brighter, producing more illumination.

There are also metal hallide lamps (http://encyclopedia.thefreedictionary.com/Metal+halide+lamp), mercury vapor lamps (http://encyclopedia.thefreedictionary.com/mercury+vapor+lamp), sodium vapor lamps http://encyclopedia.thefreedictionary.com/sodium+vapor+lamp, and a few others. Each uses a slightly different technique to achieve fluorescence or incandescence, and produces a slightly different spectrum and brightness profile.

And just to reiterate: in filamentary bulbs, it is the filament that incandesces producing white or lightly off-white light, whereas in fluorescence, the color is determined by the gas used and the amount of charge applied to the gas.

Hope that all helps... :)

Answer 6

It has to be an inert gas. The one used in the past was Nitrogen, but now they use Argon, Neon and Zenon, according to the colour of the light they want to produce. There may be one or two others now, but this technology is kept rather secret.

Answer 7

depends on the bulb if neon gas.....other its just the coating out side the bulb

Answer 8

Tungsten filament is used.

Answer 9

it is the phosphorus coating that gives the bulb its full color's

Answer 10

maybe no one could clear this answer up for you because you can't type in english...hukt on foniks rely wurkt 4 u