Question

In semiconductor at a room temperature

Answer 1

Explanation:

At room temperature, a semiconductor has enough free electrons to allow it to conduct current. At or close to absolute zero a semiconductor behaves like an insulator. When an electron gains enough energy to participate in conduction (is "free"), it is at a high energy state.

Answer 2

In a semiconductor, at room temperature, few of the electrons in the valence band gain enough energy to jump into the conduction band whereas the others remain in the valence band. Hence, the valence band is partially empty and the conduction band is partially filled.

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