A Sphere of Surface Area $1.25 \mathrm {~m} ^ { 2 }$

question 54

Multiple Choice

A sphere of surface area $1.25 \mathrm {~m} ^ { 2 }$ and emissivity 1.0 is at a temperature of $100 ^ { \circ } \mathrm { C }$ At what rate does it radiate heat into empty space? $\left( \sigma = 5.67 \times 10 ^ { - 8 } \mathrm {~W} / \mathrm { m } ^ { 2 } \cdot \mathrm { K } ^ { 4 } \right)$

• A) 7.1 W
• B) 0.71 mW
• C) 3.7 W
• D) 9.9 mW
• E) 1.4 kW

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