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Physics stationary waves help

If someone could help me with this question that would be great (:

"In a resonance tube experiment, the shortest length of tube to give a loud sound is found for two different tuning forks. For a fork of a frequency 256Hz, the length is 32cm and for a fork of frequency 512Hz, the length is 15.4cm. Calculate the speed of sound in the tube and the distance of the antinode above the top of the tube."

Thanks :biggrin:
Original post by melonlord.xx
If someone could help me with this question that would be great (:

"In a resonance tube experiment, the shortest length of tube to give a loud sound is found for two different tuning forks. For a fork of a frequency 256Hz, the length is 32cm and for a fork of frequency 512Hz, the length is 15.4cm. Calculate the speed of sound in the tube and the distance of the antinode above the top of the tube."

Thanks :biggrin:


There are 2 parts to the question, it would help if you could give more information on which part you can't do and how far you've got with this.

However...
To give you a couple of clues:
For a resonance tube at it's lowest (fundamental) frequency, the wave inside is a quarter of the wavelength of the sound wave.
Speed of sound = frequency x wavelength.

W-End correction.png

However, there is what is called an 'end correction' to the tube, because the quarter wave doesn't fit exactly inside and pokes out a bit. This 'bit' is the end correction.

Have you done this in your theory?
You get rid of the error caused by the end correction by making the 2 different measurements, as given in the question.
Does this help?
(edited 1 year ago)

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