  We have used second order relativistic hydrodynamics equipped with equation
of state which includes the critical point to study the propagation of
perturbation in a relativistic QCD fluid. Dispersion relation for the sound
wave has been derived to ascertain the fate of the perturbation in the fluid
near the QCD critical end point (CEP). We observe that the threshold value of
the wavelength of the sound in the fluid diverges at the CEP, implying that all
the modes of the perturbations are dissipated at this point. Some consequences
of the suppression of sound near the critical point have been discussed.
