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MHT CET 2024 (9 May, Shift 1) · Thermal Radiation: Black Body, Stefan & Wien

Thermal Radiation: Black Body, Stefan & Wien question from MHT CET 2024 (9 May, Shift 1)

Q58MHT CET 2024 · 9 MAY · SHIFT 1Easy

Thermal Radiation: Black Body, Stefan & Wien

Three identical metal spheres (of same surface area) have red, black and white colors and they are heated up to same temperature. They are allowed to cool. Arrange them from maximum rate of cooling to minimum rate of cooling

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Answer: (a)

Good absorbers are good emitters: emissivity order black > red > white.
Same area and temperature, so rate of cooling $\propto e$ .
So the answer is (a) black, red, white.

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