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Fluorescent lights use electric current to excite Mercury atoms, which emit UV light. The tube part of the light is covered in phosphorescent material, which is excited by the UV light the mercury produces, and emits visible light. The reason they glow is because it takes a while for an excited mercury atom to emit the UV light, and it takes even longer for the excited phosphorescent molecules to emit all of their excess energy and return to their normal energy levels, also called the ground state. The path of the energy is Electricity -> UV light-> Visible light-> your eye
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Can some minerals glow under ultraviolet light?
Yes. Only certain minerals will glow under ultraviolet light. First you have to have the uv light shining on it, then you have to turn the lights off and they will grow
How do you turn off a glow stick?
Unfortunately, there is no way to turn off a glow stick. The light from a glow stick comes from mixing two chemicals together. One chemical is inside a fragile glass vial, suspended in the second chemical. Whe the glass breaks, the chemicals mix and you get light until the chemicals finish reacting. There are military surplus stores and camping supply departments that sell glow stick covers. You "turn off" the light by dousing it -- covering it.
Why does a light stay on after switch is turned off?
Either the switch is broken or it doesn't go to that light.
Make a two examples of a sentence using the word light in different meaning?
It was a light load. Light me up. Who turned off the light?
How do you light a glow stick?
you bend it and it should make a cracking noise and turn off the lights! if it dosent work try bending it some more!
When was The Fluorescent Light Glistens Off Your Head created?
The Fluorescent Light Glistens Off Your Head was created in 2005.
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.
Can ultraviolet light be used to identify willemite?
Yes. Ultraviolet light can be used to identify willemite. In fact willemite continues to glow even after the ultraviolet light is turned off.
Why does a television when turned off still have its screen glow in the dark?
Phosphorus
What are the positive points of ulteraviolet rays?
Ultraviolet rays can be used as for fluorescent lamps as certain chemicals glow when they absorb ultraviolet. In fluorescent lamps, the sindide of the tube is coated with a white powder that gives off light when it absorbs ultraviolet. The ultraviolet is produced by passing a current through a gas in the tube.
How do eyes glow?
It is the reflection of the light off of the retina.
After absorbing ultraviolet light a mineral releases visible light rays has the property of what?
The ability of a mineral or substance to glow during and after exposure to ultraviolet light is called fluorescence. If it continues to glow after the ultraviolet light has been turned off the effect is called phosphorescence.
Is a light bulb a chemical or physical change?
A light bulb is not a change in and of itself but the process by which it gives off light is physical. While an electric current causes a given component of the bulb to glow (it may be the filament of an incandescent bulb or the vapor in a fluorescent one), but that substance does not change its chemical identity.
Our fluorescent light over the sink will not turn on after being turned off for a few hours. I can rub my cotton shirt for static and place my hand near the bulb and it will turn on?
The light fixture needs to be grounded and a new lamp installed.
Flouresecnt dyes are used in DNA electrophoresis?
fluorescent dyes is used to color-code during dna by changing the color
What does fluorescent?
Fluorescent means something is glowing, usually with visible light. Fluorescent means giving off visible (or invisible) radiation as a result of absorbing shorter wavelength radiation.
What is it that normal light bulbs give off much more than fluorescent light bulbs?
Heat.
