Homework 3 Solutions

In orionis there are 116051 23x more neutral atoms

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Unformatted text preview: on; H I Lyman α absorption comes from the n = 2→1 transition. How does the line ratio (relative strength) of these two lines differ between the Sun and λ Orionis? Does this depend on the ionization state of H? In which source would both of these lines be extremely weak? The relative strength of these lines depends primarily on the population of excited neutral atoms N3/N2 and is independent of ionization state. In λ Orionis, there are 1.16/0.51 = 23x more neutral atoms in n=3 than n=2, so we’d expect the Balmer α/Lyman α line ratio to be 23 times strong in this source than the Sun. However, ionization does factor in to the absolute strengths of these lines, which will be much weaker in λ Orionis due to the smaller fraction of neutral H atoms in the gas overall. (2) Looking through liquid water [25 pts] The figure below shows the absorption coefficient of pure liquid water as a function of wavelength from Zender & Talamantes (2006, JQRST, 98, 122) is shown above. [Note: the lowest y value should be 0.0001 m2/kg] (a) [5 pts] B...
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This document was uploaded on 02/26/2014 for the course PHYS 160 at UCSD.

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