When `N`-type of semiconductor is heated

Options

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 remain same
D. number of electrons and holes increases equally

Answer

To solve the question regarding the behavior of an N-type semiconductor when it is heated, we can follow these steps:

### Step-by-Step Solution:

1. **Understand N-Type Semiconductors**:
- N-type semiconductors are materials that have been doped with elements that have more valence electrons than the semiconductor itself (usually silicon). This results in an abundance of free electrons.

2. **Effect of Heating**:
- When an N-type semiconductor is heated, the thermal energy provided can excite some of the electrons from the valence band to the conduction band. This process creates free electrons in the conduction band.

3. **Generation of Holes**:
- When an electron moves from the valence band to the conduction band, it leaves behind a vacancy in the valence band, which is referred to as a "hole". Thus, for every electron that is excited to the conduction band, a corresponding hole is created.

4. **Conclusion**:
- Therefore, when the N-type semiconductor is heated, both the number of free electrons and the number of holes increase. This leads us to conclude that the correct option is that both the number of electrons and holes increases equally.

5. **Final Answer**:
- The correct option is: Both the number of electrons and holes increases equally.