  In this paper, we study suppression of light quark in strongly coupled
non-conformal plasmas using the AdS/CFT correspondence. The well-known falling
string profile in the bulk is considered as light quark moving through the
plasma. The maximum distance which string with energy E can travel before
falling through the horizon is interpreted as thermalization distance of light
quark in the hot-strongly coupled plasma. Our numerical results show that the
thermalization distance of light quark increases by increasing deviation from
conformal invariance. The relation between this distance and the energy of
quark and the temperature of the plasma is analyzed numerically. The jet
quenching parameter is also calculated in the non-conformal backgrounds and it
is found that the jet quenching parameter is generally decreased by increasing
the non-conformality. Our results are compared with the results of N = 4 SYM
theory and also some available experimental data.
