Doppler shift Comparison Table

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Doppler shift comparison table

Subject has value has definition

blueshift the amount of shift is directly proportional to relative velocity The shift of spectral lines toward shorter wavelengths in the spectrum of an approaching source of radiation.

redshift z = Δλ/λ where λ is the laboratory wavelength of the spectral line and Δλ is the difference between the laboratory and the observed wavelengths The shift of spectral lines toward longer wavelengths in the spectrum of a receding source of radiation.

Subject	has value	has definition
blueshift	the amount of shift is directly proportional to relative velocity	The shift of spectral lines toward shorter wavelengths in the spectrum of an approaching source of radiation.
redshift	z = Δλ/λ where λ is the laboratory wavelength of the spectral line and Δλ is the difference between the laboratory and the observed wavelengths	The shift of spectral lines toward longer wavelengths in the spectrum of a receding source of radiation.

Next wavelength shift: gravitational redshift Up: wavelength shift Previous wavelength shift: cosmological redshift