Consider two waves and that propagate through the same medium. Assume is much smaller than k1and k2. We saw in Lecture 6 that the resulting wave can be written as a product of two traveling waves, one oscillating at high frequency / short wavelength and one oscillating at low frequency / long wavelength. If the medium in which the waves propagate has a dispersion relation , where c is a constant, what approximately are the wave velocities of the high frequency andlow frequency part of the resulting wave