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Choose the correct statement about thermaf conductivity
- a)thermal conductivity for metals decreases with increase in temperature
- b)thermal conductivity for gases and insulating material decreases with increase in temperature
- c)thermal conductivity is not a function of temperature
- d)thermal conductivity increases with increase in temperature irrespective of material
Correct answer is option 'A'. Can you explain this answer?
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Verified Answer
Choose the correct statement about thermaf conductivitya)thermal condu...
Due to increase in lattice vibratioh the thermal conductivity of metals decreases with increase in temperature.
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Choose the correct statement about thermaf conductivitya)thermal condu...
Thermal Conductivity and Temperature Relationship
Thermal conductivity is the measure of a material's ability to conduct heat. It is defined as the rate at which heat flows through a material per unit area, per unit thickness, and per unit temperature gradient. Thermal conductivity depends on various factors like the type of material, temperature, and pressure.
The correct statement about thermal conductivity is option 'A', which states that thermal conductivity for metals decreases with an increase in temperature. This statement is valid for most metals, but not for all materials.
Explanation:
Thermal conductivity depends on the atomic structure of the material. In metals, the thermal conductivity is mainly due to the free electrons that carry heat from one point to another. At low temperatures, the electrons are scattered, and the thermal conductivity is low. As the temperature increases, the electrons gain more energy, and the scattering decreases, leading to an increase in thermal conductivity. This behavior is observed up to a certain temperature, beyond which the thermal conductivity starts decreasing. This decrease occurs because of the increased lattice vibrations, which hinder the movement of the free electrons.
In the case of gases and insulating materials, the thermal conductivity decreases with an increase in temperature. This behavior is due to the fact that at higher temperatures, the gas molecules or atoms vibrate with higher amplitudes, leading to a decrease in the mean free path of the molecules. This decrease in the mean free path hinders the movement of the heat, leading to a decrease in thermal conductivity.
Conclusion:
In conclusion, the correct statement about thermal conductivity is option 'A', which states that thermal conductivity for metals decreases with an increase in temperature. This behavior is due to the scattering of free electrons at low temperatures and the hindrance caused by lattice vibrations at high temperatures. However, this behavior is not universal and depends on the type of material.
Thermal conductivity is the measure of a material's ability to conduct heat. It is defined as the rate at which heat flows through a material per unit area, per unit thickness, and per unit temperature gradient. Thermal conductivity depends on various factors like the type of material, temperature, and pressure.
The correct statement about thermal conductivity is option 'A', which states that thermal conductivity for metals decreases with an increase in temperature. This statement is valid for most metals, but not for all materials.
Explanation:
Thermal conductivity depends on the atomic structure of the material. In metals, the thermal conductivity is mainly due to the free electrons that carry heat from one point to another. At low temperatures, the electrons are scattered, and the thermal conductivity is low. As the temperature increases, the electrons gain more energy, and the scattering decreases, leading to an increase in thermal conductivity. This behavior is observed up to a certain temperature, beyond which the thermal conductivity starts decreasing. This decrease occurs because of the increased lattice vibrations, which hinder the movement of the free electrons.
In the case of gases and insulating materials, the thermal conductivity decreases with an increase in temperature. This behavior is due to the fact that at higher temperatures, the gas molecules or atoms vibrate with higher amplitudes, leading to a decrease in the mean free path of the molecules. This decrease in the mean free path hinders the movement of the heat, leading to a decrease in thermal conductivity.
Conclusion:
In conclusion, the correct statement about thermal conductivity is option 'A', which states that thermal conductivity for metals decreases with an increase in temperature. This behavior is due to the scattering of free electrons at low temperatures and the hindrance caused by lattice vibrations at high temperatures. However, this behavior is not universal and depends on the type of material.
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Choose the correct statement about thermaf conductivitya)thermal condu...
A...because in case of metal as we increase the temp. then lattice distortion take place which resist to electron flow hence thermal conductivity decreases
And in case of gases thermal conductivity is due to molecular momentum which is the function of temp.( kinetic theory of gases) hence it increases with increase in temp...
And in case of gases thermal conductivity is due to molecular momentum which is the function of temp.( kinetic theory of gases) hence it increases with increase in temp...
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Choose the correct statement about thermaf conductivitya)thermal conductivity for metals decreases with increase in temperatureb)thermal conductivity for gases and insulating material decreases with increase in temperaturec)thermal conductivity is not a function of temperatured)thermal conductivity increases with increase in temperature irrespective of materialCorrect answer is option 'A'. Can you explain this answer?
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