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What do the phosphors inside fluorescent bulbs absorb to create a glow?
Wiki User
∙ 11y ago
Ultraviolet Radiation.
Wiki User
∙ 11y ago
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Why do fluroescent lights glow in the dark when swiched off?
A fluorescent tube contains (when operating) a plasma, and this excites phosphors coated on the inside of the tube. Some of these phosphors are phosphorescent, that is they will glow in the dark for a while due to being exposed to light. But that glow will soon cease. Other phosphors are fluorescent, that is they will glow only while excited. So the glow you observe is due to the phosphorescent particles in the coating, and they will soon diminish in brightness.
What is inside a fluorescent lamp that is toxic to humans?
Mercury
Compact fluorescent lamps have made a lot of changes in the lighting sector it is also changed from a fluorescent lamp to compact fluorescent lamps but still it is dependent on the ballast Why?
A ballast is an electrical component used with a fluorescent bulb (or mercury vapor lamp or arc lamp) to conduct electricity at each end of the tube. Compact fluorescent light bulbs are dependent on ballast because they use a gas to create light. when the gas is excited by electricity, it emits invisible ultraviolet light that hits the white coating inside the fluorescent bulb. The coating changes the ultraviolet light into light you can see.
When a common fluorescent lamp is on the mercury vapor inside is actually in a which state?
Gas state
What is a villi job?
Villi absorb food into the blood from inside the intestines
The light-producing element in a fluorescent bulb is the?
Light in fluorescent bulbs occurs when electricity excites the mercury vapor inside the tubular glass bulb.
Why do fluroescent lights glow in the dark when swiched off?
A fluorescent tube contains (when operating) a plasma, and this excites phosphors coated on the inside of the tube. Some of these phosphors are phosphorescent, that is they will glow in the dark for a while due to being exposed to light. But that glow will soon cease. Other phosphors are fluorescent, that is they will glow only while excited. So the glow you observe is due to the phosphorescent particles in the coating, and they will soon diminish in brightness.
Why are light bulbs coated with phosphorus?
They aren't. Ordinary filament lamps aren't coated with anything at all. The inside of fluorescent lamps are coated with a mixture of phosphors (NOT phosphorus but very complex metal salts). Fluorescent lamps work in two major steps. The electric current causes mercury vapour to emit ultra-violet light. The UV is absorbed by the phosphors and they re-emit it as coloured light. The mix of phosphors are there to emit a variety of colours so that the overall effect is a white light.
Are Fluorescent and LED lights the same thing?
NO. Fluorescent lights and LEDs are NOT the same thing, other than the fact that they both produce light. A fluorescent light consists of a glass tube or envelope with a powder [phosphor] coating on the inside of the glass which when "excited" by electrical energy created by current running through a gas, also inside the envelope, releases some of that energy in the form of light. An LED on the other hand is a solid state device with no tube, phosphors, or gas. It also converts electrical energy to light but by the interaction of two dissimilar electrically conductive compounds inside of a transparent or translucent plastic body.
What is inside a fluorescent lamp that is toxic to humans?
Mercury
Which light bulbs are coated on the inside with a powder?
fluorescent
What is fluorescent lights?
It is an artificial light that works by using electricity to ionize Mercury into vapor. Because the light produced is more ultraviolet, the inside of the tube is coated with white phosphors to make the light more visible to the human eye. Fluorescent lights are more efficient than incandescent bulbs, and they are now most commonly in the form of CFL (compact fluorescent light) bulbs which screw into ordinary incandescent light sockets. Even the traditional fluorescent fixtures are more efficient these days than over 20 years ago, since there are now solid state ballasts which don't use a bulky transformer.
Is plasma in lightning?
Yes possible
Compact fluorescent lamps have made a lot of changes in the lighting sector it is also changed from a fluorescent lamp to compact fluorescent lamps but still it is dependent on the ballast Why?
A ballast is an electrical component used with a fluorescent bulb (or mercury vapor lamp or arc lamp) to conduct electricity at each end of the tube. Compact fluorescent light bulbs are dependent on ballast because they use a gas to create light. when the gas is excited by electricity, it emits invisible ultraviolet light that hits the white coating inside the fluorescent bulb. The coating changes the ultraviolet light into light you can see.
Will a low watt transformer operate a fluorescent light bulb?
Apart from no, your question has no simple answer. Fluorescent lamps need a few kV to start them and have a 90V drop when running. All of that is provided by the "gear" needed to run a fluorescent lamp. In a compact fluorescent (CFL), the gear is inside the cap.
When a common fluorescent lamp is on the mercury vapor inside is actually in a which state?
Gas state
How is light generated through a spectrim?
If / when light is generated by heating, a continuous spectrum is generated. A small portion of this electromagnetic spectrum may be detected by humans.When light is generated by creating a plasma, then only the spectral lines particular to that substance are generated.You can perform this simple experiment yourself. If you hold a CD at an angle towards an incandescent lamp, you'll see a complete colour spectrum - there will be no breaks between the colours.If you repeat the experiment with a fluorescent (or CFL) lamp, you'll see several separate colours, with clearly no continuous grade of colour between them.This is because the fluorescent tube actually generates a plasma inside it, and the UV light from the plasma will excite the phosphors (the white coating in the tube) on the tube. It needs several phosphors to approximate the colour of white light, but it is only an approximation.
