a. If the Si conductivity is 0.2/sm, how many of the valence electrons are contributing to the conduction? e=0.19m2/V.5h=0.0425m2/V.5a=Latticedistancea=5.43A b. Grobls is doped with Aluminum ato,ns at a ratio of 108. a for GaSb is 6.12A. The unit cell contining 4Go and 456 atoms p for GG5b is 0.08m2/V.s Note that Al replaces equal number of Ga and Sb atoms. Calculate conductivity due to the substition of Al atoms. What typpe of semicorductor are we woiking with