Which of the following statements are true for semiconductors?

Which of the following statements are true for semiconductors?

The correct answer is Silicon. Semiconductors are materials that have a conductivity between conductors (generally metals) and nonconductors or insulators (such as most ceramics). Semiconductors can be pure elements, such as silicon or germanium, or compounds such as gallium arsenide or cadmium selenide.

Which of the following is semiconductors?

Silicon is a direct band gap semiconductor statement is not correct.

Which one of the following is not a correct statement about semiconductors?

At absolute zero, semiconductors are perfect insulators, The density of electrons in conduction band at room temperature is not as high as in metals, thus cannot conduct current as good as metal. The electrical conductivity of semiconductor is not as high as metal but also not as poor as electrical insulator.

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