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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoHeat TransferEasy2 min

PhysicsEasyinteger

A thin nickel plate 10 cm by 20 cm is kept at 500°C by an electric heater. Its surface emissivity is 0.3. Both faces radiate and the surroundings can be ignored. Take $σ = 5.67 \times 1 0^{- 8}$ W m⁻² K⁻⁴. Find the heater power, in W.

Answer:

243

Solution:

$A = 2 \times 0.1 \times 0.2 = 0.04$ m², $T = 773$ K. $P = e σ A T^{4} = 0.3 \times 5.67 \times 1 0^{- 8} \times 0.04 \times 77 3^{4} = 243$ W.

Subject:PhysicsTopic:Heat & ThermoSubtopic:Heat Transfer

⏱ 2m

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