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Mini-Quiz: Derivation of Doppler Effect Wavelength Equations

by Ron Kurtus (5 December 2012)

Take this Mini-Quiz to check your understanding of the lesson material.



1. What is the general Doppler Effect wavelength equation?

λO = λS(c + vS)/(c + vO)

λO = λS(c + vS)/(c − vO)

λO = λS(c − vS)/(c − vO)

2. Why does the sign of vS change when the source moves away from the observer?

It doesn't change

The direction convention is left-to-right and toward the observer

Because the wavelength changes

3. What is the change in wavelength when the observer moves toward a stationary source?

λO = λSc/(c + vO)

Δλ = λSvO/(c + vO)

Δλ = −λSvO/(c − vO)

If you got all three correct, you are on your way to becoming a Champion in Physics. If you had problems, you had better look over the material again.


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