Equation 14.34 indicates that a red (blue) shift occurs when a source and observer are receding (approaching) with respect to one another in purely radial motion (i.e., β = β,). Show that, if there is also a relative tangential speed βt, Equation 14.34 becomes and that the condition for always having a red shift




(i.e., no blue shift), λ > λ0 or v 2β, (1 €“ β,)

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