PHY3063 R. D. Field Department of Physics Chapter1_17.doc University of Florida Relativistic Doppler Shift (observer moving away)Consider a light source at rest in the O-frameshinning its light in the x direction. Since the O-frameis at rest with the source of light f = f0, λ= λ0, and T = T0, where f0, λ0, and T0are the “proper frequency”, “proper wavelength”, and “proper period”of the light. The wavefronts travel at speed c and (in the O-frame) the time between emitted wavefronts is T0and the distance between emitted wavefronts is λ0. Hence λ0= cT0which implies that λ0f = c since f0= 1/T0. Let ∆t be thetime between the rocket receiving wavefronts 1 and 2 (as observed in the O-frame). In the O-frame
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