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MHT CET 2026 (13 Apr, Shift 1) · Thermal Radiation: Black Body, Stefan & Wien

Thermal Radiation: Black Body, Stefan & Wien question from MHT CET 2026 (13 Apr, Shift 1)

Q15MHT CET 2026 · 13 APR · SHIFT 1Medium

Thermal Radiation: Black Body, Stefan & Wien

Rate of radiation by a black body is 'R' at temperature 'T'. Another body has same area but emissivity is 0.2 and temperature 3T. Its rate of radiation is

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Answer: (c)

Rate of radiation $P = e\sigma A T^4$ ; for the black body $R = \sigma A T^4$ .
$P' = 0.2\,\sigma A (3T)^4 = 0.2 \times 81\,\sigma A T^4$
$P' = 16.2R$
So the answer is (c) $16.2R$ .

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