hw5_assignment - PHY 251 Fall 2009: homework problem set 5,...

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PHY 251 Fall 2009: homework problem set 5, due in the PHY 251 drop box in room A-129 by noon on Friday, Oct. 16. 1. A hydrogen atom is photoexcited from the n = 1 state to the n = 20 state. Calculate the photon energy needed to do this, and the photon energy needed to instead ionize the atom completely. 2. The Lyman alpha line refers to the n = 1 to n = 2 transition in hydrogen, corresponding to the absorption of a photon. For light from a distant star, we see an absorption dip due to hydrogen in the periphery of the star at a wavelength of 421 nm. How fast is the galaxy moving away from us? 3. Calculate the wavelengths of the ground state to first excited state transition for hydrogen, deuterium, and tritium. Do this with enough precision to show the differences accurately. 4. Consider a muonic atom, where a muon (charge of an electron, but with a mass 207 times larger) is captured by a proton. What’s the orbital radius, binding energy of the ground state, and wavelength of radiation required to go to the first excited state? Remember reduced
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hw5_assignment - PHY 251 Fall 2009: homework problem set 5,...

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