Electrical and thermal conductivity of metals

What is the Drude model primarily used to explain?

• The magnetic properties of insulators.

• The atomic structure of gases.

• The electrical and thermal conductivity of metals.

• The color of metals.

How does the Drude model describe the motion of electrons in metals?

• Electrons in metals are fixed in place and do not move.

• The Drude model describes electrons in metals as a gas of free particles moving through a lattice, experiencing collisions with ions.

• Electrons in metals behave like a liquid flowing without resistance.

• The Drude model suggests electrons are bound to specific atoms.

How does temperature affect the conductivity of metals according to the Drude model?

• Higher temperatures increase conductivity of metals.

• Conductivity of metals is constant regardless of temperature.

• Temperature has no effect on the conductivity of metals.

• Temperature negatively affects the conductivity of metals; higher temperatures decrease conductivity.

Explain the concept of electron mobility in metals.

• Electron mobility in metals is the measure of how quickly electrons can move through a metal when subjected to an electric field.

• Electron mobility is the ability of metals to conduct heat.

• Electron mobility refers to the density of electrons in a metal.

• Electron mobility is the measure of how quickly protons can move through a metal.

Consider a metal block with two ends A and B, the metal is heated at B to a temperature T2 and the heat is getting transmitted to point A via conduction attaining a temperature T1. What will be the relation between T1 and T2

• T1>T2

• T2>T1

• T1=T2

• T2<T1

An electron within a metallic block can move freely in how many directions

• 3

• 2

• 6

• 5

The Lorentz number obtained theoretically is half of the Lorentz number obtained experimentally, the reason behind this mismatch is because

• contribution of phonon in the conductivity is neglected

• contribution of electrons in the conductivity is neglected

• contribution of photon in the conductivity is neglected

• None of the above

According to Widemann Franz law, the ratio of thermal conductivity to electrical conductivity is

• directly proportional to length of conductor

• directly proportional to temperature

• inversely proportional to length of conductor

• inversely proportional to temperature

A dimensionless constant that relates the thermal conductivity to electrical conductivity with temperature is termed as

• Planck's constant

• Lorentz number

• Avagadro's number

• Reynold's number