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Equation
       
    Name Doppler Effect (Light)
 
    Equation f L = c - v c + v f S λ L = c + v c - v λ S
 
    Definition of terms

fL= observed frequency, fS= emitted frequency, λL = observed wavelength, λS= emitted wavelength, v = relative velocity of observer and source, c = speed of light

 
    Comments

  The Doppler effect describes the change in frequency and wavelength that is observed as the source of a light wave moves with respect to the observer.

  It differs from the expression for the Doppler effect in sound waves because here we have to take account of relativity, in particular, that the speed of light is the same in all frames of reference.
 
    References

University Physics, F W Sears, M W Zemansky, 3rd edition, Addison-Wesley, 1967

       


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