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The unit of the Stefan-Boltzmann's constant is:

1. W/m²K⁴
2. W/m²
3. W/m²K
4. W/m²K²

Correct answer: W/m²K⁴

Solution

In the Stefan-Boltzmann law, radiant power per unit area is proportional to T⁴. Therefore the constant must have units that make the product come out as W/m², which gives W/m²K⁴.

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