Questions
The rectangular surface of area 8cm × 4cm of a black body at a temperature of 1270C emits energy at rate of E per second. If the length and breadth are reduced to half of its initial value and the temperature is raised to 3270C, the rate of emission of energy will be
detailed solution
Correct option is D
l1 = 8cm, b1 = 4cm; l2 = cm, b2 = 2cmT1 = 1270C = 400k, T2 = 3270C = 600kTalk to our academic expert!
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For a black body at temperature 727°C, its radiating power is 60W and temperature of surrounding is 227° C. If temperature of black body is changed to 1227°C, then its
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