A Primitive Space Heater Consists of an Iron Ball (Radius

question 67

Multiple Choice

A primitive space heater consists of an iron ball (radius 10.0 cm) through which electrical current is passed in order to heat the ball (and subsequently the surrounding air) . If the temperature of the iron ball is kept at 530 K and the room temperature is 20 °C, what net power is radiated into the room? Assume the ball is a perfect blackbody.

• A) 140 W
• B) 110 W
• C) 430 W
• D) 510 W

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