56Q6 The statements in the following list refer to solid state physics. Check th

Question

56Q6

The statements in the following list refer to solid state physics. Check the boxes of the THREE TRUE statements. In an infinite periodic crystal, Bloch's theorem ensures that the probability density associated with each electronic energy eigenfunction has the periodicity of the lattice. If a semiconductor is cooled to the absolute zero of temperature, it will not conduct electricity. In a pure semiconductor at room temperature, the number of holes in the valence band is equal to the number of electrons in the conduction band. If the semiconductor silicon (in Group 14) is doped with a sufficient number impurity atoms of the semiconductor germanium (in Group 14), the resulting material will have a lower electrical resistance than either of the pure materials. If the semiconductor germanium (in Group 14) is doped with a sufficient number impurity atoms of aluminium (in Group 13), the resulting material will conduct electricity mainly via electrons in the conduction band.

Explanation / Answer

1. In an infinite periodic crystal, Bloch's theorem ensures that the probability density associated with each electronic energy eigen function has the periodicity of the lattice.

2. If a semiconductor is cooled to the absolute zero of temperature, it will not conduct electricity.

.3. In a pure semi conductor at room temperature, the number of holes in the valance band is equal to the number of electrons in the conduction band.

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