Train (near) disaster. A person is riding a bicycle through a train tunnel at a speed of 5.0 m/s. Train A traveling at 20.0 m/s approaches from behind and sets off its horn of frequency 1000 Hz. Train B is stationary in the tunnel on a separate track. Sound waves from train A can reflect from Train B. What beat frequency does the rider hear before he dodges into a side tunnel? The speed of sound in the tunnel air is 340 m/s.
Train (near) disaster. A person is riding a bicycle through a train tunnel at a speed of 5.0 m/s. Train A traveling at 20.0 m/s approaches from behind and sets off its horn of frequency 1000 Hz. Train B is stationary in the tunnel on a separate track. Sound waves from train A can reflect from Train B. What beat frequency does the rider hear before he dodges into a side tunnel? The speed of sound in the tunnel air is 340 m/s.
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Transcribed Image Text:Train (near) disaster. A person is riding a bicycle through a train tunnel at a speed of 5.0 m/s. Train A traveling at
20.0 m/s approaches from behind and sets off its horn of frequency 1000 Hz. Train B is stationary in the tunnel on a
separate track. Sound waves from train A can reflect from Train B. What beat frequency does the rider hear before
he dodges into a side tunnel? The speed of sound in the tunnel air is 340 m/s.
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Step 1: Know about the Doppler effect and the beat frequency:
VIEWStep 2: Calculate the frequency of the sound wave coming from train A as heard by the person:
VIEWStep 3: Calculate the frequency of the sound wave coming from train A as observed by train B:
VIEWStep 4: Calculate the frequency of the wave reflected from train B as heard by the person:
VIEWStep 5: Calculate the beat frequency as heard by the person:
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