(Answered) A 550-hz longitudinal wave in air has a speed of 343 msa

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A 550-Hz longitudinal wave in air has a speed of 343 m/s.

A. How much time is required for the phase to change by 90° at a given point in space? (Given: lambda=0.624 m)

B. At a particular instant, what is the phase difference (in degrees) between two points 8.7cm apart?

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