Question

When N-type of semiconductor is heated,

• A. Number of electrons increases while that of holes decreases
• B. Number of holes increases while that of electrons decreases
• C. Number of electrons and holes remains same
• D. Number of electrons and holes increases equally

Answer 1

The correct option is D Number of electrons and holes increases equally

When a $N-$type semiconductor is heated, due to the extra thermal energy, some of the covalent bonds break forming electron-hole pairs. This produces electrons and holes in equal numbers.
So, the number of electrons and holes increase equally.

Hence, $\left(D\right)$ is the correct answer.