Question: Weak background noises from a room set up the fundamental standing wave in a cardboard tube of length L = 6 7 . 0 cm

Weak background noises from a room set up the fundamental standing wave in a cardboard tube of length L =67.0cm with two open ends. Assume that the speed of sound in the air within the tube is 343m/s.
What frequency do you hear from the tube?
If you jam your ear against one end of the tube, what fundamental frequency do you hear from the tube?

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