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Which is the best absorber of inferared radiation heat a dull surface or a shiny one?
Wiki User
∙ 11y ago
A dull surface will absorb infrared best, but it needs to be dull at infrared wavelengths. Do not judge the infrared behavior by the visible performance.
Wiki User
∙ 11y ago
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Would you expect a dull or shiny surface to be a better absorber?
Dull surface is a better absorber. A shiny surface would better reflect than absorb.
Why does a good absorber of radiant energy appear black?
In short, because they "don't reflect'." A matte surface isn't smooth; it has a surface that does not fully reflect light/radiation; the surface looks dull because there's little reflection. A smooth surface will reflect because it's smooth (glass-like) and will reflect or bounce light away from its surface. The surface looks shiny because of the reflection. The color of the surface matters because the darker the color, the more light/radiation is absorbed. Lighter colors reflect light; darker colors absorb light.
What can a shiny or light coloured surface do to heat radiation?
They absorb heat resulting a cooler environment
Why does an electric toaster has a shiny surface between the heating elements and the outer case?
Because shiny surfaces are poor emitters of radiation and therefore, no heat will be lost to the surroundings, just reflected off the shiny surface back to the toast.
Do dull silver surfaces emit the same amount of radiation as shiny white surfaces?
Dull silver surfaces and shiny white surfaces can have different emissivity values, which means they might not emit the same amount of thermal radiation. Emissivity is a property that quantifies how effectively an object emits thermal radiation compared to a perfect blackbody at the same temperature. A blackbody has an emissivity of 1, and objects with emissivity closer to 1 are better emitters of thermal radiation. Dull surfaces, including dull silver surfaces, typically have higher emissivity compared to shiny surfaces. Shiny surfaces often have lower emissivity because their smooth and reflective nature reduces their ability to emit thermal radiation effectively. White surfaces can vary in terms of their shininess and emissivity. A shiny white surface might have a lower emissivity, while a more matte or dull white surface may have a higher emissivity. Therefore, if the dull silver surface has a higher emissivity compared to the shiny white surface, it will emit more thermal radiation than the shiny white surface at the same temperature. However, it's important to note that the exact emissivity values can vary based on the specific properties and conditions of the surfaces, so it's best to refer to specific emissivity measurements for accurate comparisons.
Would you expect a dull or shiny surface to be a better absorber?
Dull surface is a better absorber. A shiny surface would better reflect than absorb.
What surface emits more radiation white shiny or silver shiny?
silver shiny
What surface is the best reflector of radiation?
Light, shiny surfaces are the best reflectors of radiation
Which emits the most infra red radiation matte silver surface or shiny black surface?
Matte (dull) and black surfaces emit infrared radiation at a faster rate than shiny and white surfaces.
Why is a petrol tanks painted silver?
This is bcoz the fuel inside is highly flammable and shiny white or silvery surface help to keep it cool and prevent it to blow everything around in tiny chunks :) As such surfaces reflect radiation and are a bad absorber of heat.
Why does a good absorber of radiant energy appear black?
In short, because they "don't reflect'." A matte surface isn't smooth; it has a surface that does not fully reflect light/radiation; the surface looks dull because there's little reflection. A smooth surface will reflect because it's smooth (glass-like) and will reflect or bounce light away from its surface. The surface looks shiny because of the reflection. The color of the surface matters because the darker the color, the more light/radiation is absorbed. Lighter colors reflect light; darker colors absorb light.
What can a shiny or light coloured surface do to heat radiation?
They absorb heat resulting a cooler environment
Why does an electric toaster has a shiny surface between the heating elements and the outer case?
Because shiny surfaces are poor emitters of radiation and therefore, no heat will be lost to the surroundings, just reflected off the shiny surface back to the toast.
How do you reflect radiation?
For IR, visible, and UV radiation; any shiny surface will do. For acoustic radiation, any massive smooth surface will do. For em radiation, any material with a very different dielectric constant from that of air will do. For ionizing radiation, there is a lot of money to be made from this discovery. That problem is yet (mainly) to be solved.
Why does a Matt surface in sunshine get hotter than a shiny surface?
Matt surfaces are better absorbers of thermal radiation than shiny surfaces, as the light "bounces" around on the Matt surface meaning more energy can be absorbed, compared to a shiny surface. A look at a cross section of a Matt surface may be helpful.
Why is the outside of a kettle shiny?
Purely aesthetics these days, to match other kitchenware. Increasingly kettles are made of plastic.
Is dull surface a good radiator of heat?
It is in fact the best radiator. Dull black is the best absorber and emitter. Then shiny black, followed by white, then silver. While the best reflector goes the other way around (silver's the best, then white, followed by shiny black, then dull black)
