We analysed temperature and velocity oscillations in the solar photosphere which are caused by propagation of acoustic-gravity waves. We calculate the oscillations using analytical solution of the system of HD equations for isothermally stratified one-dimensional atmosphere model. We investigated how well temperature oscillations in the photosphere can be described by propagation of the small-amplitude acoustic-gravity waves and how well the inversion methods can reproduce small-amplitude temperature oscillations. It is shown that the calculated velocity oscillations are in good agreement with the observed ones in most of the photosphere for frequencies of 2.5 to 4.5 mHz. Calculated temperature oscillations are in agreement with observed oscillations only in the medium photosphere, at heights from 300 to 400 km.