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.
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