p45_031 - 31. We apply Eq. 38-33 for the Doppler shift in...

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31. We apply Eq. 38-33 for the Doppler shift in wavelength: λ λ = v c where v is the recessional speed of the galaxy. We use Hubble’s law to Fnd the recessional speed: v = Hr ,where r is the distance to the galaxy and H is the Hubble constant (19 . 3 × 10 3 m s · ly ). Thus, v =[19 . 3 × 10 3 m s · ly ](2 . 40 × 10 8 ly) = 4 . 63 × 10 6 m / sand
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