  A comparative study is done of the propagation of sound pulses in elongated
Bose liquids and Bose-Einstein condensates in Gross-Pitaevskii and logarithmic
models, by means of the Thomas-Fermi approximation. It is shown that in the
linear regime the propagation of small density fluctuations is essentially
one-dimensional in both models, in the direction perpendicular to the cross
section of a liquid's lump. Under these approximations, it is shown that the
speed of sound scales as a square root of particle density in the case of the
Gross-Pitaevskii liquid/condensate, but it is constant in a case of the
homogeneous logarithmic liquid.
