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Thermal conductivity of solid metals with rise in temperature normally;
- a)increases
- b)decreases
- c)remains constant
- d)may increase or decrease depending on temperature
Correct answer is option 'B'. Can you explain this answer?
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Thermal conductivity of solid metals with rise in temperature normally...
- Thermal conductivity depends on the chemical composition of the substance.
- Thermal conductivity of the liquids is more than the gasses and the metals have the highest.
- Thermal conductivity of the gases and liquids increases with the increase in temperature.
- Thermal conductivity of the metal decreases with the increase in temperature.
- Metal, crystalline in structure, have greater thermal conductivity than non-metal.
- Thermal conductivity is affected by the phase change.
Most Upvoted Answer
Thermal conductivity of solid metals with rise in temperature normally...
Thermal conductivity of solid metals with rise in temperature normally decreases. This can be explained by the following factors:
1. Increase in phonon-phonon scattering: As the temperature of a metal increases, the number of phonons (quanta of lattice vibrations) also increases. This leads to an increase in phonon-phonon scattering, which reduces the mean free path of phonons and hence reduces the thermal conductivity.
2. Increase in electron-phonon scattering: At high temperatures, the number of free electrons in a metal also increases. These electrons can interact with the lattice vibrations (phonons) through electron-phonon scattering, which reduces the mean free path of phonons and hence reduces the thermal conductivity.
3. Changes in crystal structure: At high temperatures, some metals undergo changes in their crystal structure, which can affect the way phonons and electrons move through the lattice. This can also lead to a decrease in thermal conductivity.
4. Thermal expansion: As the temperature of a metal increases, it expands. This can lead to an increase in the distance between atoms in the lattice, which can reduce the strength of interatomic bonds and hence reduce the thermal conductivity.
In summary, the thermal conductivity of solid metals normally decreases with rise in temperature due to an increase in phonon-phonon scattering, electron-phonon scattering, changes in crystal structure, and thermal expansion.
1. Increase in phonon-phonon scattering: As the temperature of a metal increases, the number of phonons (quanta of lattice vibrations) also increases. This leads to an increase in phonon-phonon scattering, which reduces the mean free path of phonons and hence reduces the thermal conductivity.
2. Increase in electron-phonon scattering: At high temperatures, the number of free electrons in a metal also increases. These electrons can interact with the lattice vibrations (phonons) through electron-phonon scattering, which reduces the mean free path of phonons and hence reduces the thermal conductivity.
3. Changes in crystal structure: At high temperatures, some metals undergo changes in their crystal structure, which can affect the way phonons and electrons move through the lattice. This can also lead to a decrease in thermal conductivity.
4. Thermal expansion: As the temperature of a metal increases, it expands. This can lead to an increase in the distance between atoms in the lattice, which can reduce the strength of interatomic bonds and hence reduce the thermal conductivity.
In summary, the thermal conductivity of solid metals normally decreases with rise in temperature due to an increase in phonon-phonon scattering, electron-phonon scattering, changes in crystal structure, and thermal expansion.
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Thermal conductivity of solid metals with rise in temperature normally;a)increasesb)decreasesc)remains constantd)may increase or decrease depending on temperatureCorrect answer is option 'B'. Can you explain this answer?
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