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**1. The problem statement, all variables and given/known data**

A sinusoidal sound wave is described by the displacement wave function

Code:

`s(x,t)=(2.00 μm)cos[(15.7 m^(-1) )x-(858 s^(-1) )t]`

**2. Relevant equations**

**3. The attempt at a solution**

Code:

`s (x,t)=(2.00 μm) cos[(15.7 m^(-1) )(0.050m)-(858 s^(-1) )(.003 s) ]`