A black body at a temperature of 227oC radiates heat energy at the rate 5 cal/cm2−s. At a temperature of 727oC, the rate of heat radiated per unit area in cal/cm2 will be
A
80
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B
160
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C
250
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D
500
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Solution
The correct option is A 80 According to Stefen's Law, the rate of heat radiation from body is proportional to the fourth power of body's temperature.