The substances like germanium and silicon have:
Correct answer: A. Negative temperature coefficients
- A. Negative temperature coefficients
- B. Positive temperature coefficients
- C. Both A and B
- D. None of the above
Explanation
Substances with a negative temperature coefficient of resistance, such as germanium and silicon, experience a decrease in resistance as temperature increases. This property is typical of semiconductors. Option A is correct. Option B describes metals, which have a positive temperature coefficient. Option C is incorrect because a material cannot simultaneously have both types of temperature coefficients. Option D is incorrect because germanium and silicon are correctly described by option A.
This question appeared on the UHS MDCAT 2010 paper, which you can sit online with every answer explained.
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About Electrical Properties of Solids
Electrical properties of solids depend on their band structure, charge carriers and conductivity. The topic compares conductors, insulators and semiconductors, relates resistivity to temperature, and covers intrinsic and extrinsic semiconductors, donor and acceptor impurities, electron and hole conduction, and the formation of p-type and n-type materials.
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