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A sound wave is oscillating in the n=7 mode in a tube of length 3.25 m....

A sound wave is oscillating in the n=7 mode in a tube of length 3.25 m. What is the wavelength and frequency of the standing sound wave in the tube if the speed of sound is 340 m/s and:
a) The tube is open at both ends.
b) The tube is closed at both ends.
c) One end of the tube is open and the other end is closed.

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