At our distance from the Sun, the intensity of solar radiation is 1 370 W/m 2 . The temperature of the Earth is affected by the greenhouse effect of the atmosphere. This phenomenon describes the effect of absorption of infrared light emitted by the surface so as to make the surface temperature of the Earth higher than if it were airless. For comparison, consider a spherical object of radius r with no atmosphere at the same distance from the Sun as the Earth. Assume its emissivity is the same for all kinds of electromagnetic waves and its temperature is uniform over its surface. (a) Explain why the projected area over which it absorbs sunlight is πr 2 and the surface area over which it radiates is 4 πr 2 . (b) Compute its steady-state temperature. Is it chilly?
At our distance from the Sun, the intensity of solar radiation is 1 370 W/m 2 . The temperature of the Earth is affected by the greenhouse effect of the atmosphere. This phenomenon describes the effect of absorption of infrared light emitted by the surface so as to make the surface temperature of the Earth higher than if it were airless. For comparison, consider a spherical object of radius r with no atmosphere at the same distance from the Sun as the Earth. Assume its emissivity is the same for all kinds of electromagnetic waves and its temperature is uniform over its surface. (a) Explain why the projected area over which it absorbs sunlight is πr 2 and the surface area over which it radiates is 4 πr 2 . (b) Compute its steady-state temperature. Is it chilly?
Solution Summary: The author explains that the projected area over which sunlight absorbs is pir2 and the surface area — the spherical object radiates infrared light outward in
At our distance from the Sun, the intensity of solar radiation is 1 370 W/m2. The temperature of the Earth is affected by the greenhouse effect of the atmosphere. This phenomenon describes the effect of absorption of infrared light emitted by the surface so as to make the surface temperature of the Earth higher than if it were airless. For comparison, consider a spherical object of radius r with no atmosphere at the same distance from the Sun as the Earth. Assume its emissivity is the same for all kinds of electromagnetic waves and its temperature is uniform over its surface. (a) Explain why the projected area over which it absorbs sunlight is πr2 and the surface area over which it radiates is 4πr2. (b) Compute its steady-state temperature. Is it chilly?
Interaction between an electric field and a magnetic field.
What is the absolute (total) pressure experienced by a diver at a depth of 17 meters below the surface of a lake? Assume that atmospheric pressure at the surface of the lake is 101,000 Pascals, g= 9.8 m/s2, and the density of the water in the lake is 997 kg/m3. Give your answer as the number of Pascals.
A particular solid cube has an edge of length 0.59 meters and is made of a material whose density is 3500 kg/m3. What is the mass of the cube? Give your answer as the number of kilograms.
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