Question: Two objects with the same surface area are inside an evacuated container. The walls of the container are kept at a constant temperature. Suppose one

Two objects with the same surface area are inside an evacuated container. The walls of the container are kept at a constant temperature. Suppose one object absorbs a larger fraction of incident radiation than the other. Explain why that object must emit a correspondingly greater amount of radiation than the other. Thus a good absorber must be a good emitter.

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