What Is the Net Power That a Person with Surface $1.20 \mathrm {~m} ^ { 2 }$

question 1

Multiple Choice

What is the net power that a person with surface area of $1.20 \mathrm {~m} ^ { 2 }$ radiates if his emissivity is 0.895 , his skin temperature is $27 ^ { \circ } \mathrm { C }$ and he is in a room that is at a temperature of $17 ^ { \circ } \mathrm { C } ?$ $\left( \sigma = 5.67 \times 10 ^ { - 8 } \right.$ $\left. \mathrm { W } / \mathrm { m } ^ { 2 } \cdot \mathrm { K } ^ { 4 } \right)$

• A) 68.4 W
• B) 60.3 W
• C) 62.6 W
• D) 65.7 W
• E) 64.8 W

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