Pure and impure

Exercise and reference answers

Questions

1. Question

   A pure semiconductor is called

   Choices

   1. extrinsic
   2. intrinsic
   3. metallic

   Correct choice

   intrinsic

2. Question

   Its carriers come from

   Choices

   1. added impurities
   2. magnetism
   3. thermal excitation

   Correct choice

   thermal excitation

3. Question

   Those carriers are

   Choices

   1. electrons and holes
   2. protons only
   3. photons

   Correct choice

   electrons and holes

Explanation