Two Perfectly Absorbing Spheres Have Radii of R and 3R

question 76

Multiple Choice

Two perfectly absorbing spheres have radii of R and 3R. Both are held at the same temperature. The flux of radiant energy emerging from each square meter of the larger sphere is

• A) the same as the flux from the smaller sphere.
• B) 3 times the flux from the smaller sphere.
• C) 9 times the flux from the smaller sphere.
• D) 27 times the flux from the smaller sphere.

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