Calculate the number of electrons produced in a \(20 \mathrm{MeV}, 4 \mathrm{~kW}\) LINAC. Also calculate the number for neutrons produced in a \(5 \mathrm{mg}\) Tantallum target for the electron induced photoneutron \((\gamma, n)\) reaction if the reaction cross section in \(5 \mathrm{mb}\) (Assume electron-to-photon conversion as \(90 \%\) ).