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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoHeat TransferEasy2 min

PhysicsEasynumerical

A body of surface area 8.0 cm² at 527°C radiates 450 J of energy each minute. Find its emissivity. Take $σ = 5.67 \times 1 0^{- 8}$ W m⁻² K⁻⁴ and $T = 800$ K.

Answer:

0.40

Solution:

$P = \frac{450}{60} = 7.5$ W. $e = \frac{7.5}{5.67 \times 1 0 ^{- 8} \times 8 \times 1 0 ^{- 4} \times 80 0 ^{4}} = 0.40$ .

Subject:PhysicsTopic:Heat & ThermoSubtopic:Heat Transfer

⏱ 2m

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