Max & Min Frequencies from Tuning Fork Revolution

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Homework Help Overview

The problem involves a tuning fork with a frequency of 512 Hz being swung in a circular motion, raising questions about the maximum and minimum frequencies perceived by a second person due to the Doppler Effect. The scenario includes parameters such as the radius of the circle and the frequency of revolution.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants discuss the relevance of the Doppler Effect and its equations, with some questioning the order of operations in solving the problem. There is also uncertainty about the position of the second person relative to the tuning fork.

Discussion Status

Some participants have provided hints regarding the Doppler Effect, while others are exploring the implications of the second person's position. There appears to be productive dialogue about the mechanics of the situation, though no consensus has been reached on the specifics of the setup.

Contextual Notes

Participants are considering the implications of the second person's location and how it affects the perceived frequencies, but there is no definitive information about the exact distance or position. The problem's constraints and assumptions are still under discussion.

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Homework Statement



A tunning fork with frequency f = 512 Hz is held by someone who swings it vigurously in a circle in the horizontal plane. The radius of the circle is 1.0 m, and the frequency of revolution is 3.0 rev/s. (a) What are the max and the min frequencies that a second person would hear? (b) What part of the rotation corresponds to the highest frequency the second person hears, and which part corresponds to the lowest?

Homework Equations



1 rev/s = 60 rpm

1 RPM = 0.01666666667 Hz

w = 2*pi*f

The Attempt at a Solution



I have no idea how to treat this problem! I mean I cannot get the idea for relating this problem with waves and sound equations! Can you help me? Thanx
 
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You should familiarize yourself with the Doppler Effect and related equations before re-attempting this problem.
 
Have you studied the doppler effect?

I think this question is in a funny order, wouldn't you first find the points of max/min shift then find what the shift is there?
 
lewando said:
You should familiarize yourself with the Doppler Effect and related equations before re-attempting this problem.

Disconnected said:
Have you studied the doppler effect?

I think this question is in a funny order, wouldn't you first find the points of max/min shift then find what the shift is there?

Hi guys thank you for the hint!

I already solved the problem with Doppler effect eq. but I still cannot get where is the second person. I mean is he at 1m away from the one who is holding the fork?

Thank you so much
 
It doesn't matter where he is. No matter where he happens to be, the tuning fork will always be moving directly towards him at some point in its revolution, and directly away from him at some other point.
 
ideasrule said:
It doesn't matter where he is. No matter where he happens to be, the tuning fork will always be moving directly towards him at some point in its revolution, and directly away from him at some other point.

Yes you're right!

Thank you so much!
 

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