How the probability of electronic excitation varies?

Explanation

To determine how the probability of electronic excitation varies in a semiconductor, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Energy Bands**:
- In a semiconductor, there are two main energy bands: the conduction band (CB) and the valence band (VB). The conduction band is where free electrons can move and conduct electricity, while the valence band is filled with electrons that are bound to atoms.

2. **Identifying the Band Gap**:
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