In one of the original Doppler experiments, a tuba was played at a frequency of

Question

In one of the original Doppler experiments, a tuba was played at a frequency of 74.0Hz on a moving flat train car, and a second identical tuba played the same tone while at rest in the railway station.

Part A

What beat frequency was heard in the station if the train car approached the station at a speed of 6.50m/s ?

In one of the original Doppler experiments, a tuba was played at a frequency of 74.0Hz on a moving flat train car, and a second identical tuba played the same tone while at rest in the railway station.

Part A

What beat frequency was heard in the station if the train car approached the station at a speed of 6.50m/s ?

Explanation / Answer

f1 = 343*74/(343-6.5) = 75.4294 Hz

f2 = 74 Hz

beat frequency = f1 - f2 = 75.4294 - 74 = 1.4294 Hz

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