Sound Exp: Find Frequency of Sound Wave

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To find the frequency of a sound wave, one effective method involves using a resonance experiment by allowing water to fall and marking levels where resonance occurs, which helps average results and determine error bounds. Another approach is to utilize a small speaker and signal generator for a continuous sound source, potentially incorporating a microphone and spectrum analyzer for more precise measurements. The discussion raises the question of whether using advanced tools like a spectrum analyzer constitutes "cheating" if valid results are obtained. Overall, the focus is on practical experimentation techniques to accurately measure sound frequency. Validity of results remains a central concern in the methodology.
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Sound Experiment...

What experiment could you perform to find the frequency of a sound wave? I thought that you could calculate the speed of sound though hitting sticks and hearing echo, etc, and then using the v = f*lambda formula to find frequency - but how would you find the wavelength to calculate the frquency?

Thanks.
 
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Cheman said:
What experiment could you perform to find the frequency of a sound wave? I thought that you could calculate the speed of sound though hitting sticks and hearing echo, etc, and then using the v = f*lambda formula to find frequency - but how would you find the wavelength to calculate the frquency?

Thanks.

http://physics.nku.edu/GeneralLab/211 Speed of sound -tube.html

Zz.
 
I found that rather then slowly and painstakingly searching for a resonance point it may be best to simply let the water fall. As the water level drops through a resonance it will be quite noticeable make a quick mark to indicate the level of the water. Repeat this process several times. you will have a group of marks which indicate a resonance, this gives you a average and error bounds. What more could you ask for.

This can be a very quick experiment, done my way, so do lots of repetitions listening to a locating resonances.

We replaced the tunning fork with a small speaker and a signal generator, so we had a continuous source of sound.
 
Would it be cheating to use a microphone and send the signal to a spectrum analyzer ? :smile:
 
Gokul43201 said:
Would it be cheating to use a microphone and send the signal to a spectrum analyzer ? :smile:

Thats the way I'd do it.

Can you 'cheat' if you get a valid result?
 

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