#### hysics

Use non-degenerate perturbation theory to solve the following problem: Consider a string of length L, that is perturbed by having its density be slightly higher between x=L/4 and x=L/2. You should assume the density increase is uniform along the stretch.

How do the wave vectors change?

How do the angular frequencies change?

How do the eigenfunctions change?

#### Woody

No Idea.

Looks like you've beaten us with those questions...