Radiation: If the absolute temperature of an object is tripled, the thermal power radiated by this object (assuming that its emissivity and size are not affected by the temperature change) will
A. increase by a factor of 3.
B. increase by a factor of 9.
C. increase by a factor of 18.
D. increase by a factor of 27.
E. increase by a factor of 81.
Answer: E
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