CE 341 Homework Assignment #1 Due Friday, Sept 3, 2009  1.Mars radiates energy with a peak wavelength of 13.2 um a) Treating Mars as a blackbody, what would its temperature be? b) What would be the frequency and energy content of a photon at that wavelength?  2. What is the O3concentration (ug/m3) in the stratosphere at 30 km if its mixing ratio is 10 ppm? (use the US Standard Atmosphereto get P, T values, http://www.digitaldutch.com/atmoscalc/index.htm) 3.Simple Greenhouse Model. Derive the dependence of the Earth’s surface temperature (To) on the fraction fof terrestrial radiation absorbed by the atmosphere. Assume the atmosphere is an isothermal layer some distance above the earths surface. It has temperature T1and is transparent to solar radiation. Below is a sketch to get you started. Hint what is the energy balance of the atmospheric layer?  4. What is the equilibrium temperature of a cube orbiting the sun at the same orbital distance as the planet Mercury (46 x 106km)? Assume only one face of the cube is illuminated by the sun. (Hint you will first need to calculate the Solar constant for this orbital distance).
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