In metals, why does electric conductivity decrease with the increase of temperature?
Correct answer: B. Because metal ions oscillations hinder electron movement
- A. Because electron movement decrease with the increase of temperature
- B. Because metal ions oscillations hinder electron movement
- C. Because electron direction changes at high temperature
- D. Because they pass heat current through collision of electrons
Explanation
The correct option is B because metal ion oscillations hinder electron movement. As temperature increases, the vibrational motion of metal ions disrupts the movement of electrons, reducing electrical conductivity in metals.
This question appeared on the UHS MDCAT 2023 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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