1. Study F09 HW #5 and solutions

2. Affixed to a string of constant mass density and tension are two equal point masses m,
located at positions x = -d and x = +d. Compute the S-matrix for scattering of waves of
wavevector k.

3. A circular drumhead of radius a is characterized by a cone-shaped azimuthally symmetric
initial displacement, with the displacement at the origin being h. Find an expression for the
displacement for all subsequent positions and times. (The initial vertical velocity field is zero.)