Topic: Material Science
In metals, the thermal conductivity K and electrical conductivity $\sigma$ are related as $\frac{K}{\sigma T}=L$. L is known as
- A. Lattice constant
- B. Lorenz number
- C. Lanevin function
- D. Larmor number
Answer: B. Lorenz number
Explanation: The Wiedemann-Franz law states that the ratio of the electronic contribution of the thermal conductivity ($K$) to the electrical conductivity ($\sigma$) of a metal is proportional to the temperature ($T$). The proportionality constant $L$ is known as the Lorenz number.