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Doppler effect: Sound source, frequency, speed of sound

A sound source and a person are separated by 1000m. The sound source produces a frequency of 400Hz. Given speed of sound in air @ 343 m/s find:

1) Source moves toward person at 20 m/s, what frequency does the person hear?

2) If source stays still, but the person moves toward the sound source at 20 m/s, what frequency will the person hear?

Solution Summary

With good explanations and calculations, the problems are solved.