
A light source recedes from an observer with a speed vS that is small compared with c. (a) Show that the fractional shift in the measured wavelength is given by the approximate expression
This phenomenon is known as the red shift because the visible light is shifted toward the red. (b) Spectroscopic measurements of light at λ = 397 nm coming from a galaxy in Ursa Major reveal a redshift of 20.0 nm. What is the recessional speed of the galaxy?

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Chapter 24 Solutions
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