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What type of radiation does a heat lamp produce?
Much of the radiation created by a heat lamp is infrared electromagnetic radiation. A heat lamp is generally designed not to emit too much visible light, but is set up to emit most of its radiation in the red and "below red" (infrared) areas of the spectrum.
Why do schools generally use red alcohol thermometers and not mercury?
Alcohol also reacts to heat by expanding and contracting and is much safer to use than mercury which is a neurotoxin that can make you very sick if the thermometer were to break and you got in contact with it.
Why do mercury expand when heated?
When you heat a material, you cause the molecules to vibrate with more kinetic energy. So think of the mercury as a group of people standing as close to each other as possible. If you add heat to this group (which can be represented by the people starting to wiggle their bodies and flail their arms) the group will start to take up more and more space depending on how much extra wiggling they do. This is a good comparison to the molecules of mercury. As they are heated, they vibrate with larger oscillations. This will mean they need more room to "wiggle", hence the mercury will expand.
How does a thermomether works?
A mercury thermometer (like the kind a medic might use) is a thin glass tube filled with the metallic element mercury, which is a liquid. The rate at which mercury expands with heat is known and happens at a constant rate, so the movement of the mercury column up and down the tube can be read off at a scale on the side. Because mercury is relatively dense, it isn't affected too much by changes in atmospheric pressure.
Why do energy saving light bulbs use less electricity?
Energy-saving lamps, such as normal and compact fluorescents, use more of the energy they consume to produce light rather than heat. An incandescent light converts electricity to heat and light is simply a by-product of the heat.Fluorescent bulbs still have incandescent filaments, but they are used to emit the electrons that run the length of the tube colliding with the vapourised mercury and producing light.Mainly because they run "cool", a fluorescent lamp uses only about one fifth - 1/5 - of the electrical energy used by a lamp that has a hot, incandescent filament.Another good thing about fluorescent lamps is that they can have a useful life that is between 5 and 10 times longer than an incandescent lamp, saving even more money over a period of years. On the other hand, turning a fluorescent lamp on and off repeatedly, so that it only runs for for short periods, will radically shorten its lifespan. Also CFL bulbs tend to cause large amounts of radio frequency interference.If a fluorescent tube or 'bulb' is broken, the mercury is released which is poisonous.Another opinionSaying that the mercury in mercury lamps is dangerous is an urban myth which comes from the old styles of mercury discharge lamps and fluorescent tubes used over fifty years ago, which did indeed contain about a gram of liquid mercury!While in use such a lamp was not dangerous at all, but if the glass tube or bulb got broken the "blob" of mercury could certainly be dangerous to human health if anyone picked it up with their bare fingers or swallowed it to see what how it tasted.Mercury is the only example we have on Earth of a metal that is in its liquid state at room temperature. It was such a "curiousity" that several people did get ill - and may have died - from poisoning by mercury, but not much of it would have came from old fashioned "mercury lamps"!That said, anyone who advises you that "fluorescent lights contain mercury which is poisonous" about today's fluorescent lamps is making a very misleading statement which could be intended just to frighten people.No matter whether they are the "compact" or the "long tube" types, modern fluorescent lamps contain only an extremely tiny amount of a special mercury amalgam so that, whilst a modern lamp is in use, there is absolutely no danger to anyone.However, if such a lamp gets broken, then care must be taken to sweep up all the fragments carefully and dispose of them sensibly in something strong enough not to be cut by the broken glass, such as an old corrugated cardboard box or similar bound around with gaffer tape to stop it from being opened easily.Today, the main danger to people is the risk of getting cuts from the shards of glass, not from mercury poisoning!The answers to the Related Questions shown below give a lot more information about how compact fluorescent lamps work and about the very good savings you will achieve in the cost of electricity if you use them instead of normal incandescent lamps.
Can a lava lamp give off heat like can it heat up a cold room?
One lamp won't do much. I have 10 and my room is always really hot when they are all on
How far mercury expands when heated?
It depend upon the temperature how much you heat it
Will a egg cook faster under a blow dryer or lamp?
An egg will cook quicker under a blow dryer than a lamp because a blow dryer will transfer heat much quicker than a lamp.
Why is venus more hoter than Mercury?
Venus is hotter than Mercury because Venus has a atmosphere and Mercury doesn't so Mercury can't keep so much heat in as Venus can.
Why mercury's surface temperature varies so much from day to night?
The night side of Mercury is not receiving any direct sunlight. Because Mercury is so close to the sun, the day side of Mercury has a significant increase in heat.
Will your house plant grow with heat from a lamp?
No, because the lamp does not produce the type of light and heat energy like the sun produces and the plant can not perform its photosynthesis which is the process of which the plant grows, and it also depends on what type of plant you have.
Where should permanently installed ceiling heat lamp be installed in a bathroom?
This is old school technology and hasn't been done for years in construction. What used to happen, the bathroom being a small room didn't have much ceiling area. Centrally locating the heat lamp fixture to a good position sometimes positioned the fixture in the radius of the in-swinging bathroom door. On many occasions the door was left under the heat lamp with the lamp on and the door caught fire from the build up of heat from the lamp. The electrical code made a revision to keep the fixture out of the arc radius of the door and this made for some strange locations of the fixture. The installing of heat lamp fixtures has just gone out of favour. It has been replaced with in floor heating in bathrooms.
What type of radiation does a heat lamp produce?
Much of the radiation created by a heat lamp is infrared electromagnetic radiation. A heat lamp is generally designed not to emit too much visible light, but is set up to emit most of its radiation in the red and "below red" (infrared) areas of the spectrum.
What happens if you use a mercury source instead of sodium vapour lamp in diffraction grating experiment?
sodium vapour lamps produce much higher light output (about 90 lumens/watt) they cannot be used in lighting applications where colour-rendering property is very crucial. This is because most of the light emitted from a sodium vapour lamp is concentrated in the yellow part of the visible spectrum (around 580-590 nm) On the other hand, a mercury vapour lamp is quite suitable for lighting applications. This is because, the mercury vapour lamp can feed almost the entire visible region (380-780 nm) of the human visual system.
How much does a lamp costs?
It depends on what type of lamp you want.
What is the working temperature of mercury lamp?
The peaks of the emission from the ionized vaporof mercury are:-- 184.5 nm . . . UV-C-- 253.7 nm . . . UV-C-- 365.4 nm . . . UV-A-- 404.7 nm . . . violet-- 435.8 nm . . . blue-- 546.1 nm . . . green-- 578.2 nm . . . yellow-orange.The quantum wavelength of the lamp itself is much shorter than any of those.
Does the distance from the sun to a planety affect the planets temperature?
Not necessarily - Mercury is closer to the sun than Venus, yet Venus is MUCH hotter than Mercury. THis is due to Venus' atmosphere, which collects and holds the suns heat, while Mercury is void of an atmosphere and the heat can't build up. Think if Venus as an oven with the door closed - Mercury is the same oven but with the door open.... Also - the sun is the source of heat for our solar system - NOT the whole Universe. Yes, if you think about it, the sun is the source of heat for the whole universe. The closer the planet, the hotter it is.
