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| 1. |
C,Si and Ge have same lattice structure.Why is C insulator while Si and Ge instinsic semiconductors? |
| Answer» Solution :The 4 bonding electronsof C, SI or Gelie, RESPECTIVELY,in the SECOND , third and fourth orbit . Hence , energy REQUIRED to take out and electron from these atoms (i.e., ionisation energy `E_(g ) `)will be LEAST for Ge,following by Si and highest for C. Hence, number of free electrons for conduction in Ge and Si are significant but negligiblesmall for C. | |