The question says: \"The standing waves inside of the Ruben\'s tube are similar

Question

The question says: "The standing waves inside of the Ruben's tube are similar to the standing waves on a string...In class we measured the length of the pipe (2.03m) and the wavelength of the 3rd harmonic of the standing waves in the Ruben's tube (wavelength=1.36m). The frequency is 330hz. Use this information to find the velocity of the sound in the gas used inside the tube." I wasn't sure exactly how to go about doing this, I used the wavelengthn=2length/n with n equal to 3 for the third harmonic but I'm not sure if that's what I'm supposed to do..I got 438.9m/s for my final answer

Explanation / Answer

given length of the tube L = 2.03m wave length of third harmonic = 1.36m frequency f = 330Hz standing waves formes in the open tube for third harmonic    velocity of sound     v = 2Lf/3       = 446.6m/s

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