Properties of Semiconductors: Practice Problem & Solution

Short Solution (Best for NEET):

To solve this problem, we apply the core principles of Properties of Semiconductors. Understanding the underlying formula is key to arriving at the correct answer below:

At absolute zero, the valence band is completely full and the conduction band is completely empty. At room temperature, thermal energy excites a fraction of electrons from the valence band to the conduction band, leaving holes behind. Thus both bands are partially filled.