Q40. A piece of copper and another of germanium are cooled from room temperature to 100 K. The resis

Q: What is the correct answer for CUET UG Physics Q40?

The correct answer is b. Copper is a conductor. For conductors, resistance generally decreases as temperature decreases. This is because cooling reduces the thermal vibrations of the atoms in the crystal lattice, leading to fewer collisions between electrons and the lattice, thus increasing electron mobility and reducing resistance.Germanium is a semiconductor. For semiconductors, resistance generally increases as tempera

Q: Q40. A piece of copper and another of germanium are cooled from room temperature to 100 K. The resistance of: (a) copper increases and germanium decreases (b) copper decreases and germanium…

The correct answer is b. Copper is a conductor. For conductors, resistance generally decreases as temperature decreases. This is because cooling reduces the thermal vibrations of the atoms in the crystal lattice, leading to fewer collisions between electrons and the lattice, thus increasing electron mobility and reducing resistance.Germanium is a semiconductor. For semiconductors, resistance generally increases as tempera

Q: What are the options for this CUET UG Physics question?

A. copper increases and germanium decreases · B. copper decreases and germanium increases · C. each of them increases · D. each of them decreases

Question

Q40. A piece of copper and another of germanium are cooled from room temperature to 100 K. The resistance of:
(a) copper increases and germanium decreases
(b) copper decreases and germanium increases
(c) each of them increases
(d) each of them decreases

FirstInTest · Accepted Answer

Copper is a conductor. For conductors, resistance generally decreases as temperature decreases. This is because cooling reduces the thermal vibrations of the atoms in the crystal lattice, leading to fewer collisions between electrons and the lattice, thus increasing electron mobility and reducing resistance.Germanium is a semiconductor. For semiconductors, resistance generally increases as temperature decreases. This is because at lower temperatures, fewer electrons have sufficient thermal energy to jump from the valence band to the conduction band, significantly reducing the number of free charge carriers available for conduction, thus increasing resistance.Therefore, when cooled from room temperature to 100 K, the resistance of copper will decrease, and the resistance of germanium will increase.

Answer

copper increases and germanium decreases

Answer

copper decreases and germanium increases

Answer

each of them increases

Answer

each of them decreases

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