Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoHeat TransferEasy2 min

PhysicsEasynumerical

A cube of edge 5.0 cm radiates 30 W when its surface is at 527°C and the surroundings are at 27°C. Find its emissivity.

Answer:

0.09

Solution:

$A = 6 \times 0.05^{2} = 0.015$ m². $e = \frac{30}{5.67 \times 1 0 ^{- 8} \times 0.015 \times ( 80 0 ^{4} - 30 0 ^{4} )} = 0.088$ .

Subject:PhysicsTopic:Heat & ThermoSubtopic:Heat Transfer

⏱ 2m

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