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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoHeat TransferMedium2 min

PhysicsMediumsingle choice

The tungsten filament of an electric lamp has a surface area $A$ and a power rating $P$ . If the emissivity of the filament is $ε$ and $σ$ is Stefan's constant, the steady temperature of the filament will be:

Options:

Answer:

Solution:

In steady state $P = ε σ A T^{4}$ , so $T = (\frac{P}{A ε σ})^{\frac{1}{4}}$ . D.

Subject:PhysicsTopic:Heat & ThermoSubtopic:Heat Transfer

⏱ 2m

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