Sound Question: Chimney Flue Resonating at Fundamental Frequency

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Homework Help Overview

The discussion revolves around a problem involving a chimney flue that resonates at its fundamental frequency when wind blows over it. The context includes the length of the flue, the speed of sound, and the nature of the sound produced, which is described as low pitch.

Discussion Character

  • Exploratory, Conceptual clarification, Problem interpretation

Approaches and Questions Raised

  • Participants are exploring the relationship between the length of the flue and the fundamental frequency of sound. Questions about whether the door at the bottom of the flue is open or closed are raised, along with inquiries about how to approach the problem. Some participants suggest looking into the properties of standing sound waves in open and closed pipes.

Discussion Status

The discussion is ongoing, with participants seeking clarification on how to begin solving the problem. Some guidance has been offered regarding the properties of standing waves in pipes, but there is no explicit consensus on the interpretation of the sound characteristics or the state of the door at the bottom of the flue.

Contextual Notes

Participants note the ambiguity of the description of the sound as merely "low pitch," which raises questions about its implications for the problem. There is also a mention of the need to consider the differences in fundamental frequencies for closed versus open pipes.

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A chimney flue is 15m long from the open top of the chimney to the door at the bottom of the stack that can be opened or closed from within the fireplace. When wind blows over the chimney, a low pitch sound can be heard. Assuming speed of sound is 350m/s and this sound is the air coloumn within the flue resonating at its fundamental frequency, is the dorr at the obttom of the flue opened or closed? Show all work to support your answer! Explain the logic behind your final answer.

thanks. :smile:
 
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Also, I'm not sure what to do here, so please can someone help me out. :shy:
 
can someone tell how to start...i'm looking at my notes and textbook...and can't find information related to this.
 
Standing Sound Waves

Look up standing sound waves in open and closed pipes. (An "open" pipe is one open at both ends; a "closed" pipe is usually closed at one end and open at the other.) Such pipes can resonate at various frequencies. (Think of musical wind instruments.) The fundamental frequency is the lowest one that can create a resonant standing wave in the pipe.

Open and closed pipes of the same length will have different fundamental frequencies.
 
1. What is the wave length of a fundamental wave in a 15m pipe
a) closed at one end
b) open at one end

Although I don't see how being told only "a low pitch sound" will help- that's pretty indefinite. You should be able to see immediately that the fundamental frequency of a closed pipe is twice that of an open pipe. Does that help?
 
Also, we're told more about the sound than it's simply low pitch...
 

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