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A black body is at 727°C. It emits energy at a rate which is proportional to:

1. (1000)^4
2. (1000)^2
3. (727)^4
4. (727)^2

Correct answer: (1000)^4

Solution

The energy emitted by a black body is proportional to the fourth power of its absolute temperature (Stefan-Boltzmann law). Converting 727°C to Kelvin gives 1000 K, so the energy is proportional to (1000)^4.

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