Q.

How many types of hetero-junctions are available?

A. two
B. one
C. three
D. four
Answer» A. two
Explanation: hetero-junctions are classified into an isotype and an-isotype. the isotype hetero-junctions are also called as n-n or p-p junction. the an-isotype hetero-junctions are called as p-n junction with large band-gap energies.
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