Question: A sound wave is described by D(y, t) = (0.0200 mm) sin[(8.96 rad/m)y + (3140 rad/s)t + /4 rad], where y is in m

A sound wave is described by D(y, t) = (0.0200 mm) × sin[(8.96 rad/m)y + (3140 rad/s)t + π/4 rad], where y is in m and t is in s.
a. In what direction is this wave traveling?
b. Along which axis is the air oscillating?
c. What are the wavelength, the wave speed, and the period of oscillation?

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