A telephone lineman is told to stretch the wire between two poles and estimate the tension in the wire. As the lineman does not have a scale to measure forces, he decides to measure the frequency of a standing wave on the wire when he shakes it. He shakes the wire so that an m = 3 (third harmonic) standing wave is set up on the wire, with a frequency of 1.6 Hz. The distance between the poles is 59 m, and the mass of 59 m of wire is 13 kg. What is the tension in the wire?

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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.