While standing near a railroad crossing, a person hears a distant train horn. The frequency detected by the person is 440 Hz. The train is traveling at 20.0 m/s and the speed of sound is 346 m/s. What is the frequency of the horn?
Added by Emilio F.
Step 1
Given: Speed of sound, v = 346 m/s Velocity of the train, vs = 20.0 m/s Frequency detected by the person, fr = 440 Hz Using the Doppler effect formula for approaching source: fr = v / (v - vs) * fs fr = 346 / (346 - 20) * fs fr = 346 / 326 * 440 fr = 466.9 Hz Show more…
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