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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 = / = 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 = 5000 A Observed at = 5050 A What is the Redshift? Wavelength Shift = 50 A z = / = 50/5000 (1% shift or z = 0.01) The = 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 lt-yrs) Milky Way Galaxy: R = 8.2 0.3...
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