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# lab12 - Lab 12 Doppler Effect Last Modified Key Concept...

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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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lab12 - Lab 12 Doppler Effect Last Modified Key Concept...

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