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MHT CET 2025 (19 Apr, Shift 1) · Thermal Radiation: Black Body, Stefan & Wien

Thermal Radiation: Black Body, Stefan & Wien question from MHT CET 2025 (19 Apr, Shift 1)

Q42MHT CET 2025 · 19 APR · SHIFT 1Easy

Thermal Radiation: Black Body, Stefan & Wien

Black sphere of radius R radiates power P at certain temperature $T$ . If the temperature is doubled, the radius gets doubled. Now the power radiated would be

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Answer: (d)

$P = \sigma(4\pi R^2)T^4 \Rightarrow P \propto R^2T^4$
$\dfrac{P'}{P} = 2^2\times2^4 = 64$
So the answer is (d) 64 P.

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