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Absorbtivity is a measure of the ability to absorb radiation. The absorbtivity of a typical black painted surface is .96-.99. Typical white painted surface ~ .3 - .33. Solar radiation is usually considered to be around 420 Btu/hr-ft^2. Emmisivity, or the ability of a black body to radiate or re-radiate in some cases, is highly dependent on many variables. Try re-asking the question.

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13y ago

Light is the typical source of heat on Earth. The sun's rays heat the earth and it is the absorption of such light that causes an object to absorb or emit heat. Because black surfaces absorb all wavelengths of light, it makes sense that they become more heated than objects of different colors that reflect some wavelengths of light.

Heat related to other factors such as friction will not be effected by the color of an object unless light is also playing a role in heating the object.

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Q: Why do black surfaces absorb and emit more heat?
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What is the difference between the way black and white surfaces affect light?

White surfaces reflect light and heat. Black surfaces do not reflect light and they absorb heat.White surfaces reflect light and heat. Black surfaces do not reflect light and they absorb heat.White surfaces reflect light and heat. Black surfaces do not reflect light and they absorb heat.White surfaces reflect light and heat. Black surfaces do not reflect light and they absorb heat.


Why does shiny surfaces absorbe more energy then dull surfaces?

Because, shiny surfaces reflect heat, they don't emit much heat and they don't absorb much heat!


The best absorbers of heat are what kinds of surfaces?

Black surfaces with large area absorb heat best (a powder for example that is black).


Which surfaces absorb heat?

All surfaces absorb some heat.


What types of surfaces absorb heat?

Dark, rough, and/or porous surfaces absorb the most heat (ex. Asphalt)


What surfaces are better absorbers and emitters of thermal radiation?

Dark matt surfaces absorb heat radiation falling on them much better than bright glossy surfaces, such as gloss white or silver. They also emit much more heat radiation (at any given temp.)


Factors affecting the temperature of soil?

Humus content of the soil. What think the heat scientists about black surfaces and heat absorption? Black surfaces absorb heat faster and contain it longer. Mostly, humus is black or dark in color. Soil with much of the humus content tends to absorb more heat and gets heated faster than soil c9ontaining less humus.


What is the characteristic of black surface?

A black surface can absorb heat more than other coloured surfaces......the absorbed heat is not used by it ..........but it is radiated through the opposite surface..................


Black body radiation of the emission o light from metal surfaces false or true?

False. Black body radiation refers to the emission of light from an object that absorbs all incident radiation. While metals can emit light, the term "black body radiation" specifically refers to the emission from an idealized object, called a black body, which is not typically applicable to metal surfaces.


Why dull black surface heats up more quickly than bright shiny surfaces?

The shinier the object, the more heat will reflect off of it. For example, a black carwill heat up much faster as the dull black will absorb the heat, while a shiny coloured car will reflect the heat molocules off.


Do all object equally conduct absorb of or emit heat?

no , its not equal .


Does gray absorb more light then white?

Yes it does. Black absorbs the most light. That is why in a car, for example, black seats are hotter than white or tan. Also the material matters as well. Rougher surfaces absorb more heat than smoother surfaces. That is also why leather seats absorb more light, or heat, and feel hotter than other material seats.