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Two automobiles are equipped with the same single
Chapter 13, Problem 52P(choose chapter or problem)
Problem 52P
Two automobiles are equipped with the same single frequency horn. When one is at rest and the other is moving toward the first at 15 m/s, the driver at rest hears a beat frequency of 5.5 Hz. What is the frequency the horns emit? Assume T = 20°C.
Questions & Answers
QUESTION:
Problem 52P
Two automobiles are equipped with the same single frequency horn. When one is at rest and the other is moving toward the first at 15 m/s, the driver at rest hears a beat frequency of 5.5 Hz. What is the frequency the horns emit? Assume T = 20°C.
ANSWER:
Step 1 of 2
Speed of the sound at is
The two automobile horns have the same frequency say . One is at rest and the other moves towards the first with speed of .
Now there will be Doppler shift in the received frequency of the moving horn as recorded by the driver at rest. The received frequency is;
Here is the Speed of the sound at and is the speed of the automobile.