Question 9: A tube with only the left end (x = 0m) closed has a length of 2.5m and contains air at 25°C. What is the speed of sound in the tube, in m/s? Question 10: What is the fundamental frequency for the tube, in Hz? Question 11: What is the frequency of the third harmonic for the tube, in Hz? Question 12: For the third harmonic there are displacement node(s)

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Interference of sound

Seiche

A seiche is an oscillating standing wave in a body of water. The term seiche pronounced saysh) can be understood by the sloshing of water back and forth in a swimming pool. The same phenomenon happens on a much larger scale in vast bodies of water including bays and lakes. A seizure can happen in any enclosed or semi-enclosed body of water.