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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoHeat TransferMedium2 min

PhysicsMediumnumerical

A filament of effective surface area 1.0 cm² is at 1900 K and radiates 70% of what a black body would at the same temperature. Taking $σ = 5.67 \times 1 0^{- 8}$ W m⁻² K⁻⁴, find the power it radiates, in W.

Answer:

51.70

Solution:

$P = 0.7 σ A T^{4} = 0.7 \times 5.67 \times 1 0^{- 8} \times 1 0^{- 4} \times 190 0^{4} = 51.7$ W.

Subject:PhysicsTopic:Heat & ThermoSubtopic:Heat Transfer

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