Doppler Effect: a Boy on a Bicycle Approaches a Brick

question 40

Multiple Choice

Doppler effect: A boy on a bicycle approaches a brick wall as he sounds his horn at a frequency 400.00 Hz. The sound he hears reflected back from the wall is at a frequency 408.00 Hz. At what is the speed is the boy riding his bicycle toward the wall? Assume the speed of sound in air is 340 m/s.

• A) 3.68 m/s
• B) 333 m/s
• C) 6.67 m/s
• D) 6.80 m/s
• E) 3.37 m/s

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