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I need help with this, please! A car horn emits a frequency of 400 Hz. A car traveling at 20.0 m/s sounds the horn as

I need help with this, please!

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A car horn emits a frequency of 400 Hz. A car traveling at 20.0 m/s sounds the horn as it moves towards a stationary pedestrian. The speed of sound in air is 343 m/s. What frequency does the pedestrian hear, a) when the car is approaching the pedestrian? b) when the car is leaving the pedestrian

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