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Mini-Quiz: Derivation of Doppler Effect Velocity Equations

by Ron Kurtus (1 December 2012)

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



1. How do you find the velocity for a moving source and stationary observer?

Take the general equation, set vS = 0, and solve for vS

Take the general equation, set vO = 0, and solve for vS

Take the general equation, set vO = 0, and solve for vO

2. What is the velocity with respect to frequency for a moving observer and stationary source?

vS = − cΔf/fO

vO = −cΔλ/λO

vO = cΔf/fS

3. Why is -c used for the wave velocity after it is reflected off a moving object?

The wave is going in the opposite direction of the x-axis

The velocity of the object is subtracted from the wave velocity

It is one of the mysteries of the Doppler Effect

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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