Question:
Given below are two statements:
Assertion (A): The conductivity of metals decreases with increase in temperature.
Reason (R): More phonons excitation take place at higher temperature.
Given below are two statements:
Assertion (A): The conductivity of metals decreases with increase in temperature.
Reason (R): More phonons excitation take place at higher temperature.
Assertion (A): The conductivity of metals decreases with increase in temperature.
Reason (R): More phonons excitation take place at higher temperature.
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In metals, higher temperature increases electron-phonon scattering, so conductivity decreases.
Updated On: May 19, 2026
- Both A and R are correct and R is the correct explanation of A
- Both A and R are correct but R is not the correct explanation of A
- A is correct but R is not correct
- A is not correct but R is correct
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The Correct Option is A
Solution and Explanation
Concept:
In metals, electrical conductivity depends on the scattering of free electrons.
Step 1: Check Assertion.
As temperature increases, conductivity of metals decreases. \[ A \text{ is correct} \]
Step 2: Check Reason.
At higher temperature, lattice vibrations increase. These vibrations are represented by phonons. \[ R \text{ is correct} \]
Step 3: Check explanation.
More phonon excitation causes more electron-phonon scattering. This reduces relaxation time and decreases conductivity. \[ R \text{ correctly explains } A \] \[ \therefore \text{Correct Answer is (A)} \]
In metals, electrical conductivity depends on the scattering of free electrons.
Step 1: Check Assertion.
As temperature increases, conductivity of metals decreases. \[ A \text{ is correct} \]
Step 2: Check Reason.
At higher temperature, lattice vibrations increase. These vibrations are represented by phonons. \[ R \text{ is correct} \]
Step 3: Check explanation.
More phonon excitation causes more electron-phonon scattering. This reduces relaxation time and decreases conductivity. \[ R \text{ correctly explains } A \] \[ \therefore \text{Correct Answer is (A)} \]
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