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Unformatted text preview: What is fractional shift in wavelenghts? [also in pitch or frequency] v = 70mph c s = 700mph Velocity of Doppler Shift: v / c = Δλ / λ = z v= c z (z is called the “Redshift”) Example: 5% shift in wavelenght means that v = 0.05c Example (Dopller Efect): Using Light (EM waves) Rest Wavelength λ = 5000 A Observed at λ = 5050 A What is the Redshift? Wavelength Shift Δλ = 50 A z = Δλ/λ = 50/5000 (1% shift or z = 0.01) The Δλ = 50 A wavelength shift corresponds to a redshift z = 0.01 Doppler formula v ≈ c z = 0.01 The speed of light is c ≈ 300,000 km/s Galaxy is moving at 0.01 c (v = 3000 km/s) D = v/H = (3000 km/s) / (75 km/s/Mpc) ≈ 40 Mpc (or 130 million ltyrs) Milky Way Galaxy: R = 8.2 ± 0.3...
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This note was uploaded on 04/02/2008 for the course ASTR 2010 taught by Professor Shull during the Spring '08 term at Colorado.
 Spring '08
 SHULL
 Astronomy, Cosmology

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