An avalanche of sand along some rare desert sand dunes can produce a booming that is
Chapter 17, Problem 85(choose chapter or problem)
An avalanche of sand along some rare desert sand dunes can produce a booming that is loud enough to be heard 10 km away. The booming apparently results from a periodic oscillation of the sliding layer of sandthe layers thickness expands and contracts. If the emitted frequency is 90 Hz, what are (a) the period of the thickness oscillation and (b) the wavelength of the sound?
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