# Earth’s surface absorbs an average of about 960. W/m 2 from the Sun’s irradiance. The power absorbed is P abs = (960. W/m 2 ) ( A disc ), where A disc = π R E 2 is Earth’s projected area. An equal amount of power is radiated so that Earth remains in thermal equilibrium with its environment at nearly 0 K. Estimate Earth’s surface temperature by setting the radiated power from Stefan’s law equal to the absorbed power and solving for the temperature in Kelvin. In Stefan’s law, assume e = 1 and take the area to be A = 4 π R E 2 the surface area of a spherical Earth. ( Note : Earth’s atmosphere acts like a blanket and warms the planet to a global average about 30 K above the value calculated here.)

### College Physics

11th Edition
Raymond A. Serway + 1 other
Publisher: Cengage Learning
ISBN: 9781305952300

### College Physics

11th Edition
Raymond A. Serway + 1 other
Publisher: Cengage Learning
ISBN: 9781305952300

#### Solutions

Chapter
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Chapter 11, Problem 67AP
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