Measuring the speed of sound in an iron tube

  • #1
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For physical experiment I have a project in which I have to measure the speed of sound in the air.

1. If I take an iron tube (inside is air) and a speaker,
2. put the speaker at the beginning of a tube,
3. speaker is connected to frequency generator (with which I can change frequencies),
4. turn the generator on,

How can I determine when the sound given by iron tube is 'the loudest' if beside I have speaker which also gives sound through generator?
I'm interested how to isolate the sound of frequency generator.
 

Answers and Replies

  • #2
Dale
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You will need a pair of microphones and digital recorder that can sample the two signals simultaneously.

Have you thought about the speed of sound you expect and the anticipated wavelength and frequency?
 
  • #3
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Honestly, I haven't thought about expected values. What worries me more is experimental error I'm going to get and I got a feeling it will be quite big.
I'm at beginning and collecting ideas, because I don't want to copy-paste experiments from youtube.
 
  • #4
Dale
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Honestly, I haven't thought about expected values. What worries me more is experimental error I'm going to get
The two are related, that is why I ask. Forget the tube for a minute and just think about measuring the speed of sound in air. Once you have figured that out then you can place the tube in the middle and see how it changes.
 
  • #5
boneh3ad
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I feel like perhaps you guys are overthinking things here. Perhaps in jusr missing something, but a series of sound pulses from a speaker and two transducers should give a pretty good answer by employing a cross-spectrum.
 

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