The Wiedemann-Franz law gives σ T K = 2.44 × 1 0 − 8 W Ω K − 2 . Copper has an electrical conductivity σ = 5.96 × 1 0 7 S m − 1 at 300 K. Find its thermal conductivity in W m − 1 K − 1 (nearest whole number).

K = 2.44 × 1 0 − 8 × 5.96 × 1 0 7 × 300 = 436 W m − 1 K − 1 . The same free electrons carry charge and heat.

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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoHeat TransferMedium2 min

PhysicsMediuminteger

The Wiedemann-Franz law gives $\frac{K}{σ T} = 2.44 \times 1 0^{- 8}$ W $Ω$ $K^{- 2}$ . Copper has an electrical conductivity $σ = 5.96 \times 1 0^{7}$ S $m^{- 1}$ at 300 K. Find its thermal conductivity in W $m^{- 1}$ $K^{- 1}$ (nearest whole number).

Answer:

436

Solution:

$K = 2.44 \times 1 0^{- 8} \times 5.96 \times 1 0^{7} \times 300 = 436$ W $m^{- 1}$ $K^{- 1}$ . The same free electrons carry charge and heat.

Subject:PhysicsTopic:Heat & ThermoSubtopic:Heat Transfer

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