In this paper we employ our previously formulated constitutive relatio
ns for an elastic heat conductor to examine the nonlinear influence of
the temperature on the propagation of second sound. Utilizing the met
hod of geometric optics we ascertain that large values of second sound
travel more slowly than do smaller ones. As well, numerical results f
or a signaling problem are displayed graphically in order to highlight
the qualitative properties of the temperature and strain waves. The c
hoice of signaling data was motivated by experimental studies.