why does the electrical conductivity of semiconductors increase with rise in temperature?

Explanation

To understand why the electrical conductivity of semiconductors increases with a rise in temperature, we can break down the explanation into several steps:

### Step-by-Step Solution:

1. **Understanding Energy Bands**:
- Semiconductors have two important energy bands: the valence band and the conduction band.
- At absolute zero (0 Kelvin), the valence band is completely filled with electrons, while the conduction band is empty.

...