Imagine a Space Heater Consisting of an Iron Ball (Radius

question 28

Multiple Choice

Imagine a space heater consisting of an iron ball (radius 10.0 cm) through which electrical current is passed in order to heat the ball. What temperature would it need to be in order to radiate a net power of 500 W into the surrounding air (which is at a temperature of 20 °C) ? Assume the ball is a perfect blackbody.

• A) 510 K
• B) 350 K
• C) 730 K
• D) 530 K

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