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InterviewSolution
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A black body emit heat at the rate of `20 W`, when its tempertaure is `227^(@)C` Another black body emits heat at the rate of `15 W`, when its temperature is `227^(@)C`. Compare the area of the surface of the two bodies, if the surrounding is at `NTP`A. `16:1`B. `1:4`C. `12:1`D. `1:12` |
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Answer» Correct Answer - D `P_(1)/(P_(2))= (sigmaA_(1)T_(1)^(4))/(sigmaA_(2)T_(2)^(4))` or `(A_(1))/(A_(2))=(P_(1)T_(2)^(4))/(P_(2)T_(1)^(4))= (20)/(15)xx((227+273))/((272+273))=1/2` |
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