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State and explian Stefan - Boltzmann law. |
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Answer» Solution :Stefan.s law states that the rate of emission or radiant energy by unit area of a perfectly BLACK BODY is directly proportional to the fourth power of its absolute temperature. `i.e.,E prop T^(4) or E = SIGMA T^(4) `, where `sigma` isthe Stefan.s CONSTANT. If the body is not perfectly black and its emissivity or relative emittance is .e. then `E = e sigma T^(4)` . |
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