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QPages 96-97: Q2: HC Verma: Concepts of Physics - Volume 2 Heat Transfer Pages 96-97: Q2 Solution: Does a body at 20�C radiate in a room, where the room…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often assume that a cooler body stops radiating or that net heat flow implies zero emission. You must distinguish between the absolute rate of emission, which is always non-zero for $T > 0$, and the net heat transfer, which becomes zero when the rate of absorption from the warmer surroundings equals the rate of emission.

Does a body at 20�C radiate in a room, where the room temperature is 30�C? If yes, why does its temperature not fall further?

Step-by-Step Verified Solution

**Answer:** Yes, a body at 20�C radiates in a room at 30�C. Its temperature does not fall further because it simultaneously absorbs radiation from the surroundings. **Step-by-Step Explanation:** All bodies radiate thermal radiation at all temperatures. A body at 20�C emits radiation, but it also absorbs radiation from the surrounding bodies at 30�C. At equilibrium, the rate of absorption equals the rate of emission, so the net temperature remains constant at 20�C [citation:13].

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