Radiation: How much power does a sphere with a radius of 10 cm radiate into empty space if is has an emissivity of 1.0 and is kept at a temperature of 400 K? (? = 5.67 × 10-8 W/m2 ? K4)
A. 60 W
B. 70 W
C. 180 W
D. 210 W
E. 360 W
Answer: C
Physics & Space Science
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