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How Much Power Does a Sphere with a Radius of 10

Question 28

Multiple Choice

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? (σ = 5.67 × 10-8 W/m2 ∙ K4)


A) 60 W
B) 70 W
C) 180 W
D) 210 W
E) 360 W

Correct Answer:

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