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The Doppler shift formula for the frequency detected is where f ' is the frequency emitted, v is the speed of sound, vD is the speed of the detector, and vs is the speed of the source. Suppose the source is traveling at 5 m/s away from the detector, the detector is traveling at 7 m/s toward the source, and there is a 3 m/s wind blowing from the source toward the detector. The values that should be substituted into the Doppler shift equation are:
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