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| 1. |
State and explian Stefan - Boltzmann law. |
| Answer» <html><body><p></p>Solution :Stefan.s law states that the rate of emission or radiant energy by unit area of a perfectly <a href="https://interviewquestions.tuteehub.com/tag/black-898687" style="font-weight:bold;" target="_blank" title="Click to know more about BLACK">BLACK</a> <a href="https://interviewquestions.tuteehub.com/tag/body-900196" style="font-weight:bold;" target="_blank" title="Click to know more about BODY">BODY</a> is directly proportional to the fourth power of its absolute temperature.<br/>`i.e.,E prop T^(4) or E = <a href="https://interviewquestions.tuteehub.com/tag/sigma-1207107" style="font-weight:bold;" target="_blank" title="Click to know more about SIGMA">SIGMA</a> T^(4) `, where `sigma` isthe Stefan.s <a href="https://interviewquestions.tuteehub.com/tag/constant-930172" style="font-weight:bold;" target="_blank" title="Click to know more about CONSTANT">CONSTANT</a>.<br/> If the body is not perfectly black and its emissivity or relative emittance is .e. then `E = e sigma T^(4)` .</body></html> | |