The wave equation for transverse vibrations of a string with a linear 'restoring force' takes the form 62y 62y 67\"?!\" where a and b are positive constants. By considering a plane wave solution of the form yUJ) = A0050\" * cut), nd the corresponding dispersion relation. Hence nd the wave speed c C>C and the group speed cg and determine whether 3 or vice versa. A is a constant amplitude