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Pressure Waves

A hollow log, open at one end, is struck with a stout stick. The hollow cavity of the log is 6 meters long, and the pressure waves that constitute sound travel at 342m/s. What are the frequencies of the resulting first four harmonics?

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Since the log is open at one end and close at the other, the first four modes in this log ...

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The solution contains the equations and calculations necessary to solve the problem.