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A 0.75m long instrument tube has two open sides as a standing sound wave moves through...

A 0.75m long instrument tube has two open sides as a standing sound wave moves through it (speed of sound is 343 m/s). You count 4 nodes in the tube.

(a) Find the wavelength and frequency.
(b) You suddenly close both ends of the tube. The number of nodes doesn't change, but their positions do What is different about the air pressure and displacement? How did the wavelength and frequency change?

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