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Standard VII

Physics

Black-Body Radiation

The rectangul...

Question

The rectangular surface or area 8 cm ×4 cm of a black body at a temperature of 127⁰C emits energy at the rate of E per second. If the length and breadth of the surface are each reduced to half of its initial value, and the temperature is raised to 327⁰C, the rate of emission of energy will become

3/8 E

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81/16 E

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9/16 E

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81/64 E

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Solution

The correct option is D
81/64 E

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The rectangular surface or area 8 cm ×4 cm of a black body at a temperature of 1270C emits energy at the rate of E per second. If the length and breadth of the surface are each reduced to half of its initial value, and the temperature is raised to 3270C, the rate of emission of energy will become

The correct option is D 81/64 E

The correct option is D
81/64 E