The addition of arsenic to germanium makes the latter a an- a) Extrinsic semiconductor b) Metallic conductor c) Intrinsic semiconductor d) Mixed conductor?

The addition of arsenic to germanium makes it an extrinsic semiconductor (option a). This is because arsenic acts as a dopant, introducing free charge carriers (electrons) into the germanium, which enhances its electrical conductivity compared to intrinsic germanium.