Why conductivity of conductor decreases while of semiconductor increases with increasing temperature?

Explanation

To understand why the conductivity of a conductor decreases while that of a semiconductor increases with increasing temperature, we need to analyze the behavior of free electrons in both types of materials.

### Step-by-Step Solution:

1. **Understanding Conductivity**:
- Conductivity (\( \sigma \)) of a material depends on two main factors:
- The number of free electrons available for conduction.
- The rate of collisions between these free electrons and the lattice atoms.
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