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				| 1. | When Stefan-Boltzmann law is applied to a black body, it takes the form | 
| A. | E = σ T | 
| B. | E = σ T <sup>2</sup> | 
| C. | E = σ T <sup>3</sup> | 
| D. | E = σ T <sup>4</sup> | 
| Answer» E. | |