  A widely used relativistic Fermi gas model and plane-wave impulse
approximation are tested against electron-nucleus scattering data. Inclusive
quasi-elastic cross section are calculated and compared with high-precision
data for C, O, and Ca. A dependence of agreement between calculated cross
section and data on a momentum transfer is shown. Results for the C(nu_mu,mu)
reaction are presented and compared with experimental data of the LSND
collaboration.
