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A fluorescent lamp consists of a glass tube filled with a mixture of argon and mercury vapour. Metal electrodes at each end are coated with an alkaline earth oxide that gives off electrons easily.
What metal element is used in a fluorescent bulb?
Mercury (Hg) is an essential, irreplaceable element in CFLs and FLs and makes them an efficient light source, making them a safe alternative to incandescent bulbs. If used properly, no mercury is released when the bulbs are in use and pose no danger as a result.
Which of the following elements presents inside the fluorescent tube?
Notes: A fluorescent lamp tube is filled with a gas containing low-pressure mercury vapor and argon, xenon, neon, or krypton. The pressure inside the lamp is around 0.3% of atmospheric pressure.
What are fluorescent bulbs filled with?
A fluorescent lamp tube is filled with a gas containing low pressure mercury vapour and noble gases at a total pressure of about 0.3% of the atmospheric pressure.
What elements are used in light bulbs?
Light bulbs started off with elements made of carbon, but over the years inventors added new elements such as tungsten, mercury, chlorine and europium to their toolkits.
What is a fluorescent material?
Fluorescence is the ability of certain chemicals to give off visible light after absorbing radiation which is not normally visible, such as ultraviolet light.
Are fluorescent lights incandescent?
Incandescent and fluorescent are two types of light, which are commonly produced by bulbs. An incandescent light bulb works by heating a filament in the bulb. Fluorescent light is a bright light produced by electricity flowing through a tube filled with ionized gas.
Do the fluorescent lights contain the same element?
The insides of the fluorescent light are coated with phosphor powder, which is a combination of several different elements and contains fluorine. This is the reason that fluorescent lights look like they are frosted on the inside.
Which chemical is used in fluorescent tube?
A fluorescent lamp tube is filled with a mix of argon, xenon, neon, or krypton, and mercury vapor. The pressure inside the lamp is around 0.3% of atmospheric pressure.
What element’s spectrum is seen within the spectrum of a fluorescent light?
The combined spectrum of the mercury plus the phosphor yields the characteristic light of a fluorescent bulb. Fluorescent lights convert more than 20% of the electrical energy to light, which is 10 times more efficient than incandescent light bulbs.
Why are fluorescent bulbs composed of several elements?
In order to convert the UV light given off by the mercury into visible light, the insides of fluorescent light bulbs are coated in a thin layer of phosphor – specifically, a blend of mixed phosphates. The phosphor layer blocks most of the ultraviolet light and what remains is emitted as visible light.
Which gas is filled in fluorescent tube lights?
Construction. A typical mercury fluorescent tube consists of a glass tube, and up to 2400 mm long, filled with argon or krypton gas and containing a drop of liquid mercury.
What element is coated inside the bulb that converts UV radiation to visible light?
Induction lights create light by using an electromagnetic field to excite mercury particles mixed in an inert gas. The mercury, present inside the lamp, creates a UV light that excites the phosphor coating inside the walls of the bulb to emit visible light.
What are fluorescent pigments?
Pigments that can be stimulated by light to give brighter and more brilliant colours than conventional pigments are known as fluorescent pigments. Often, it is UV light that is responsible for this brilliance, so these pigments can also be known as UV fluorescent pigments.
What makes a compound fluorescent?
A fluorophore (or fluorochrome, similarly to a chromophore) is a fluorescent chemical compound that can re-emit light upon light excitation. Fluorophores typically contain several combined aromatic groups, or planar or cyclic molecules with several π bonds.
How are fluorescent colors made?
A fluorescent dye molecule begins at the lowest state of energy possible – the Ground State. When light shines on it, a photon of light is absorbed by the molecule. In effect, energy is absorbed. This excites the electrons inside the molecule to higher energy states – known as the Excited State.
Is LED a fluorescent?
Fluorescent bulbs contain inert gas within the glass casing while LEDs are a solid state technology. Fluorescent lights produce UV radiation and then convert it into visible light through the use of a phosphor coating inside the bulb.
Are LED lights incandescent or fluorescent?
The production and use of LEDs requires significantly less energy than incandescents or CFLs. With LED lighting products, you’ll throw away fewer lamps and stop worrying about their mercury content. LED lighting products are free of mercury and other toxic materials, a clear win for the environment.
Do fluorescent lights emit UV?
All fluorescent lamps emit some UV. Typical fluorescent lamps, including CFLs, which consumers would encounter, emit very low levels of UV. In order to measure any UV radiation from these lamps, very sensitive measuring equipment must be used.
How do fluorescent materials work?
Fluorescent materials produce light instantly, when the atoms inside them absorb energy and become “excited.” When the atoms return to normal, in as little as a hundred thousandth of a second, they give out the energy that excited them as tiny particles of light called photons.
Are neon lights fluorescent?
Fluorescent lights are similar to neon devices. Like neon lights, a very carefully controlled electrical current enters the light and arcs from one end of the bulb to the other, passing through a gas on its way. However, the gas used in fluorescent lights has no neon.
Do fluorescent lights come in bulbs?
While there are multiple types of LED and fluorescent tube lights, the three most common are T12, T8 and T5. The terminology comes from “T” for “tubular” and the diameter of the bulb in eighths of an inch, so “T8” represents a tube of 8/8ths of an inch, or 1 inch.
