Lab 12: Doppler Effect
Last Modified 02/15/2009
Key Concept:
functions
Theory
An important phenomenon in acoustics is the Doppler Effect, which is the apparent change in the frequency
of a sound wave due to the relative motion of the source, receiver, or both. We are interested in writing a
function
that computes the frequency of the sound wave heard by the receiver.
The relationship is given by this formula:
where
•
f
r
= the frequency of the sound wave heard by the listener (standard units: Hz)
•
f
s
= the frequency of the sound wave at the source (standard units: Hz)
•
v
w
= the velocity of the sound wave (the speed of sound is 340 m/s)
•
v
r
= the velocity of the receiver (standard units: m/s)
•
v
s
= the velocity of the source (standard units: m/s)
Finally, we follow these rules for the signs:
•
When the source is moving toward the receiver, the sign on
v
s
is negative.
•
When the receiver is moving toward the source, the sign on
v
r
is positive.
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 Fall '10
 25 m/s, 10 m/s, 30 m/s, 15 m/s

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