JAMB Physics 2019 Objective — Question 21
Question 21 of 40 from the Joint Admissions and Matriculation Board (JAMB) Physics 2019 Objective paper, with the correct answer and a full explanation.
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Which of the following is correct?
- A. metals have forbidden band gaps while semiconductors do not
- B. metals are always harder than non-metals
- C. the resistance of metals decreases with temperature while the reverse is the case for semi-conductors
- D. the resistance of metals increases with temperature while the reverse is the case for semi-conductorsCorrect
Explanation
The resistance of metals increases with temperature (as conductivity decreases), while for semiconductors, resistance decreases with temperature (conductivity increases) as more charge carriers become available.
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