Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoHeat TransferMedium2 min

PhysicsMediuminteger

A spherical metal ball of radius 2 cm is kept at 1200 K by an internal heater in a room at 300 K. Its emissivity is 0.4. Find the heater power, in W.

Answer:

235

Solution:

$P = e σ \cdot 4 π r^{2} (T^{4} - T_{0}^{4}) = 0.4 \times 5.67 \times 1 0^{- 8} \times 4 π 0.02^{2} (120 0^{4} - 30 0^{4}) = 235$ W.

Subject:PhysicsTopic:Heat & ThermoSubtopic:Heat Transfer

⏱ 2m

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