4.4 The window of a Geiger-Muller detector is made of mica and has a thickness of 0.02 kg/m (p= 2.6 10 kg/m). For mica composition, use NaAl-Si-O0(OH). a. What is the minimum electron energy that will just penetrate this window? b. What is the energy loss, in MeV/mm, of an electron with the kinetic energy determined in (a) moving in mica? c. What is the energy loss, in MeV/mm, of a 6-MeV alpha particle moving in mica? d. Will a 6-MeV alpha particle penetrate this mica window?