The relevant formula is the Stefan-Boltzman formula:
Here, / is the rate at which energy is radiated from the blackbody, is the Stefan-Boltzmann constant, is the emissivity of the blackbody (which is equal to 1 for an ideal Blackbody), is the area of the blackbody, and is the temperature in Kelvin. Replacing by therefore increases the rate at which energy is radiated by a factor of . So, answer (E) is correct. |

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