Adding a Few Impurity Atoms, Like Arsenic or Gallium, to a Semiconductor

question 10

Multiple Choice

Adding a few impurity atoms, like arsenic or gallium, to a semiconductor can produce

• A) gravitational repulsion of the impurity atoms, like the expanding universe.
• B) abundant thermal inversion.
• C) a significant increase in mass, even though the impurity atoms are quite sparse.
• D) useful changes in the conductivity.

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