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Unless indicated otherwise,
Chapter 16, Problem 49E(choose chapter or problem)
Problem 49E
Unless indicated otherwise, assume the speed of sound in air to be v = 344 m/s.
A car alarm is emitting sound waves of frequency 520 Hz. You are on a motorcycle, traveling directly away from the parked car. How fast must you be traveling if you detect a frequency of 490 Hz?
Questions & Answers
QUESTION:
Problem 49E
Unless indicated otherwise, assume the speed of sound in air to be v = 344 m/s.
A car alarm is emitting sound waves of frequency 520 Hz. You are on a motorcycle, traveling directly away from the parked car. How fast must you be traveling if you detect a frequency of 490 Hz?
ANSWER:
Step 1 of 3
We need to find the velocity of the motorcycle as it moves away from the car whose alarm is emitted at a frequency of
It is a clear case of doppler shift. As the motorcycle which is the listener moves away from the car alarm, the frequency drops.
Listener's frequency:
Source frequency:
Speed of sound:
Speed of sound: