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

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answer is D.

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Detailed Solution

l1 = 8cm, b1 = 4cm; l2 = cm, b2 = 2cmT1 = 1270C = 400k, T2 = 3270C = 600k

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