The Doppler shift was first tested in 1845 by the Frenchscientist B. Ballot. He

Question

The Doppler shift was first tested in 1845 by the Frenchscientist B. Ballot. He had a trumpet player sound a(n) 495 Hznote while riding on a flat-car pulled by a locomotive.At the same time, a stationary trumpeter played the samenote. Ballot heard 4 beats/s. The speed of sound in air is 343m/s
How fast was the train moving toward him? Answer in units of m/s. The Doppler shift was first tested in 1845 by the Frenchscientist B. Ballot. He had a trumpet player sound a(n) 495 Hznote while riding on a flat-car pulled by a locomotive.At the same time, a stationary trumpeter played the samenote. Ballot heard 4 beats/s. The speed of sound in air is 343m/s
How fast was the train moving toward him? Answer in units of m/s.

Explanation / Answer

Actual frequency f = 495 Hz beat frequency f ' = 4 Hz speed of sound v = 343 m / s apperent frequency F = f + f '                                  = 499 Hz     Since train moves towardshim we know F = [ v / ( v - v ' ) ] f from this speed of train v ' = 2.74949 m / s

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