Chapter: Kinetic Theory of Gases and Radiation· Physics

The ratio of emissive power of a perfect black body at 927ºC and 327ºC is ____.

Q.1 (viii) The ratio of emissive power of a perfect black body at 927ºC and 327ºC is ____.

A. 2 : 1

B. 4 : 1

C. 8 : 1

D. 16 : 1

Doubtly Asked 29 Oct 2026 Board exam · July 2024 hsc 12th Save WhatsApp Report

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Answer: D. 16 : 1

Answer: (d) 16 : 1

By Stefan’s law \(E \propto T^4\). \(T_1 = 927 + 273 = 1200\) K and \(T_2 = 327 + 273 = 600\) K, so \(\dfrac{E_1}{E_2} = \left(\dfrac{1200}{600}\right)^4 = 2^4 = 16\).

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The ratio of emissive power of a perfect black body at 927ºC and 327ºC is ____.

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