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The forbidden gap within germanium and s...

The forbidden gap within germanium and silicon are 0.7 eV and 1.1 eV respectively. It implies that

A

both silicon and germanium are perfect conductors at very low temperatures but very good insulators at room tempertures

B

both silicon and germanium are perfect insulators at all temperatures

C

both silicon and germanium are perfect insulators at low temperatures but start conduction at room temperatures with silicon somewhat better conductor than germanium

D

same as (3) above but with germanium showing better conductivity at room temperature.

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