In accordance with Kirchhoff\'s law (assume transmissivity a t → 0 for all the cases):

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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoHeat TransferMedium2 min

PhysicsMediummultiple choice

In accordance with Kirchhoff\'s law (assume transmissivity $a_{t} \to 0$ for all the cases):

Options:(select one or more)

Answer:

A, B, C

Solution:

With $a_{t} = 0$ , $a + r = 1$ . Emissivity equals absorptivity. A bad absorber is a bad emitter (A) and a good reflector (B). A bad reflector has large $a$ , so it is a good emitter (C). A bad emitter is a bad absorber, so D is false.

Subject:PhysicsTopic:Heat & ThermoSubtopic:Heat Transfer

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