Physics
Define Emissive Power
The emissive power of a body at a given temperature is the amount of energy emitted per unit time per unit area of the surface…
Heat Radiation
Physics
Why desert is very hot in day time and extremely cold at night?
Sands are very good absorbers of radiation and at the same time sands are very good radiators. At day time sands absorb heat from the…
Physics
Why the space craft’s have highly polished surfaces?
Space Craft’s have highly polished surfaces to reflect away the radiated heat from the sun. The fire man wear garments with highly polished surfaces so…
Physics
Why we feel warmer in a cloudy night than a clear day?
A cloudy night is found to be warmer than a clear night. This is due to the fact that cloud being practically opaque does not…
Physics
Why the people in hot countries wear light colored clothes?
In hot countries people keep cold by wearing light colored cloths and in white painted house. This reduces the amount of heat absorbed, because white…
Physics
Why the cooking vessels are painted dull black outside?
For rapid heating, the cooking vessels should preferably be painted dull black outside so as to increase its absorbing power. On the other hand, the…
Physics
What do you mean by Black body?
Black body: A body having the capability to absorb all the heat radiations of all wavelength completely, incident on it, is known as perfectly black…
Physics
What do you mean by global warming?
Global Warming: Due to green house effect the earth is gradually being warmed up and the temperature is very slowly increasing. The reasons behind this…
Physics
What is heat radiation?
Transmission of heat by radiation does not require any material medium. We can get both heat and light from the sun by radiation. In between…
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