2. Assuming a general form for a travelling water wave
$\frac{H}{2}\sin(kx - \omega t)$
y(x, t) =
where k is the wavevector, H is twice the wave amplitude and ? is the angular
frequency, show that the expression for the time-dependent air volume within
an oscillating water column is:
$V(t) = V_c + \frac{wH}{k}\sin(\frac{kL}{2})\sin(\omega t)$
where $V_c$ is the total cavity volume, L is cavity dimension perpendicular to the
wavefront and w is the cavity dimension parallel to the wavefront.