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Unformatted text preview: lines, which are shifted from their usual rest wavelength lambda 0. (Lambda= Wavelength) Doppler Effect Calculation The faster something moves, the bigger the change in wavelength Lambda 0 = rest wavelength emitted by the source Delta (triangle thing) lambda = wavelength change due to Doppler effect Vr= radial velocity (speed) The light of a moving source is blueshifted or redshifted by [Delta lambda/lambda 0 = Vr/C] (c = speed of light) Ex. A certain spectral line (Hcx) has a rest wavelength of 656 nm Suppose we observe a stars spectrum with the Hcx line at (Lambda) = 658 nm. Question: how fast is this star moving? Is it moving toward us or away? (Lambda 0) = 656 nm (rest wavelength)...
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- Spring '09