Solutions04

# Solutions04 - =-4.69 log(W Î = log(0.560 Ã… 5895.94 Ã…...

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HOMEWORK 4 Astronomy & Astrophysics – Chapter 8 The two solar absorption lines given in the table below are produced when an electron makes an upward transition from the ground state orbital of the neutral Na I atom. λ (Å) W (Å) f 3302.98 0.067 0.0049 5895.94 0.560 0.3250 Using the general curve of growth for the Sun (see below), compute the number of absorbing Na I atoms per unit area of the photosphere. log (W / λ ) = log (0.067 Å / 3302.98 Å)
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Unformatted text preview: = -4.69 log (W / Î» ) = log (0.560 Ã… / 5895.94 Ã… ) = -4.02 log (f Î» / 5000 Ã… ) = log [(0.0049) (3302.98 Ã… / 5000 Ã… )] = -2.49 log (f Î» / 5000 Ã… ) = log [(0.3250) (5895.94 Ã… / 5000 Ã… )] = -0.42 log N f (Î» / 5000 Ã… ) = 12.8 log N f ( Î» / 5000 Ã… ) = 14.6 log N = 12.8 â€“ (-2.49) = 15.3 log N = 14.6 â€“ (-0.42) = 15.0 Average log N = 15.15 N = 1.4 x 10 15 /cm 2 The problem is worth 10 points....
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