What has high temperature visible light or ultraviolet?
Neither visible light nor ultraviolet light have high temperature, because temperature is associated with molecular movement and light is an electromagnetic wave or particle having no temperature. Infrared light is given off by matter that is raised to high temperature, but that is not the same as having temperature.
What form of electromagnetic wave falls just before visible light on the electromagnetic spectrum?
That depends which way you are moving along the electromagnetic spectrum. If you are moving from low to high frequency, then the last category before visible light is infrared radiation. If you are moving from short to long wavelength, then the last category before visible light is ultraviolet radiation.
What is the value of the ozone layer?
The ozone layer is transparent to visible light, but is opaque to high energy ultraviolet light, and therefore it filters out most of the ultraviolet light in sunlight. If this ultraviolet reaches the surface, instead of being filtered out by the ozone layer, it is very damaging to the cornea of the eye, causing cataracts, it also causes excessive sunburning (which can cause skin cancer), and has a variety of other dangerous effects.
What Type of light comes from a black light?
A true "black light" should emit only ultraviolet radiation. Violet light waves have the highest frequency visible to a human eye. Ultraviolet has a higher frequency, and the human eye cannot detect it. When you buy a "black light" at the party store, in addition to the ultraviolet radiation, the bulb will usually give off violet light as well (analogous to a yellow light bulb looking a bit orange). You can see the violet light…
At what temperature do objects begin to glow with visible light?
If you consider the phenomena of fluorescence then there is no temperature dependence at all. Elements near absolute zero will still fluoresce as the high energy light shone on them will elevate electrons to high energy states and they will then descend down through the energy level emitting visible light according to their particular energy states.
Why does an object appear blue in normal sunlight?
Normal sunlight is composed of electromagnetic waves of frequencies encompassing the entire visible light range, as well as some wavelengths outside the visible range (such as infra-red and ultraviolet). All these visible frequencies combined makes white light. Any object that appears blue in sunlight reflects the blue part of the visible light (at the high-frequency end of the visible spectrum), and absorbs the other colours.
What colors indicates to an astronomer that a star has a very high surface temperature?
The color of light is an indication of the energy it carries, and the energy is a function of wavelength and frequency. Higher frequencies have shorter wavelengths and carry higher energies. The red end of the visible spectrum has the longest wavelengths and lower frequencies, so represent relatively lower energies. Blue light carries higher energies, so a star that has a strong output of blue (or ultraviolet) light has the higher surface temperature.
What two lights can't we see?
Ultraviolet and infrared wavelengths are invisible to the naked (human) eye. cw: Yes, in general, you can't see light with higher energy than violet or lower than red. On the low end, that energy level starts with infrared. On the high side, that energy level starts with ultraviolet. Between is the visible light spectrum.
What type of energy does a light bulb produce?
A light bulb radiates energy in form of electromagnetic waves. Most of them are in the infrared part of the spectrum (heat), some visible light and some in higher regions of the spectrum (ultraviolet), especially bulbs with very high filament temperature (halogen). Another answer A light bulb does not "produce" energy it uses electricity or more specifically changes electrical energy to electromagnetic waves in the forms of thermal and light. Thermal (or heat) waves at…
What are the Advantages of photomultiplier tube?
They are extremely sensitive detectors of light including visible light, ultraviolet light and near infrared. They are able to multiply the signal produced by the incident light by figures up to 100 million. In addition to their very high levels of gain, photomultipliers also exhibit a low noise level, high frequency response and a large collection area.
What makes up a visible light?
Visible light is the portion of the electromagnetic spectrum from 380 nanometers to 740 nm. Electromagnetic waves, or photons, with a wavelength shorter than 380 nm will be ultraviolet (literally "beyond violet", since the low end of visible light is violet light) and wavelengths larger than 740 nm will be infrared (literally "below red", since the high wavelengths of visible light are red). The energies associated with visible light increase in the same order as…
Why are the spectra of a lamp different from a fluorescent light if the light looks similar to your eyes?
The incandescent light bulb, or incandescent lamp, works by heating an electrical filament until it glows like a fire, and, like a fire, procuces mostly mid-spectrum light. A fluorescent style light uses high voltage energy to turn an inert gas and/or mercury vapor into a plasma that emits ultraviolet radiation. That ultraviolet radiation is converted into visible light using phosphorus powders. When a phosphorus chemical is exposed to U.V. radiation it will fluoresce, producing a…
What are some examples of light energy?
Light energy is the energy carried by photons. Although there aren't really different types of light, we separate these out by frequency and wavelength so we can better identify what they can and will do. They range from very low to extremely high frequency; radio waves, microwaves, infrared, visible light, ultraviolet, X-rays and gamma rays.
How does Ultraviolet light work?
UV light is the same as any other kind of light or radiation along the spectrum from radioactive waves to radio waves. The difference between them is their wavelength and fequency. The longer the wavelength, the less the frequency. UV light is high-frequency short-wavelength light, just a bit more high-frequency than the highest-frequency visible light, which is violet. How does light work? Well, even physicists aren't quite sure.
How does temperature effect what stars look like?
The varying surface temperature of stars emits varying "temperature" electromagnetic radiation. Hot stars are a brilliant white when looking at only visible light while cooler stars are redder. However to human eyes specifically, most stars will always look pure white due to them emitting visible EM radiation at equal levels. Heat = energy. High energy = high energy EM radiation. All light is electromagnetic radiation mind you.
Can a radiator give out light?
Yes indeed, an older style electric radiator will give out visible light as well as heat. Older style gas heaters give out quite a high colour temperature light, due to the chemicals used in the mantle. And one may argue that infra-red and ultraviolet are both forms of light. By analogy with ultra-sonic and infra-sonic where these are both considered sound, even if we cannot hear them. The origin word is radiate, the root of…
How does heat transfer to food from a lamp?
Heat is transferred via three methods: conduction (ice cube in your hand), convection (ice cube in your drink), and radiation (light). The Sun radiantly heats the Earth, by sending out heat as light. The "heat lamps" produce infrared radiation (largely), the food absorbs much of this light, and the temperature of the food increases until it can transfer that extra energy away. Sourced from SafeSpectrum.com website: When a fluorescent lamp is turned on, electrons begin…
Is it possible to manufacture fluorescent ink?
Yes, fluorescent inks can be manufactured. And they are. To keep it simple, something that is fluorescent will fluoresce under high energy light, usually ultraviolet light. This high energy light will be absorbed by the fluorphore, and it will re-emit light of a lower energy, usually in the visible spectrum where we can see it. (The rest of the light energy of the incoming light will retained as heat - atomic and/or molecular vibration.) Fluorescent…
What two types of light can be viewed from Earth?
This question needs refining as there is no 'type' of light. Light is an electromagnetic wave which is defined by its wavelength or frequency. As you increase the wavelength the frequency decreases and vice versa. A high wavelength/low frequency refers to light which can be described as infrared, microwave and radio (with increasing wavelength). A low wavelength/high frequency refers to light which can be described as ultraviolet, x-ray and gamma ray. In between the high…
What is light emmiting diode?
L.E.D or light emitting diode A light-emitting diode (LED) is a semiconductor light source.[3] LEDs are used as indicator lamps in many devices and are increasingly used for other lighting. Introduced as a practical electronic component in 1962,[4] early LEDs emitted low-intensity red light, but modern versions are available across the visible, ultraviolet, and infrared wavelengths, with very high brightness
Should electromagnetic radiation be avoid at all costs?
No mainly because it is impossible. The electromagnetic spectrum is everywhere visible light is a small part of it as are radio waves. It isn't a bad idea to avoid some of it X rays, ultraviolet light, microwaves etc. are potentially harmful hence the issue with cell phones high tension power cables etc.