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Carbon, silicon, and germanium have four valence electrons each. At room temperature, which one of the following statements is most appropriate?

When a semiconductor is heated,its resistance

The effect of an increase in temperature on the number of electrons in the conduction band $(n_e)$ and the resistance of a semiconductor will be as follows:

On heating a semiconductor:

If the lattice constant of this semiconductor is decreased,then which of the following is correct?

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