Train (near) disaster. A person is riding a bicycle through a train tunnel at a speed of 5.0 m/s. Train A traveling at20.0 m/s approaches from behind and sets off its horn of frequency 1000 Hz. Train B is stationary in the tunnel on aseparate track. Sound waves from train A can reflect from Train B. What beat frequency does the rider hear beforehe dodges into a side tunnel? The speed of sound in the tunnel air is 340 m/s.

Doppler Effect: When there is relative motion between the source of sound and the observer, then the…

Answered: Train (near) disaster. A person is…

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