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The thermal and electrical conductivities of copper at 20C are 380 Wm-1 K-1 and 5.67 107 -1 m-1 number. respectively. Calculate the Lorentz number

The thermal and electrical
conductivities of copper at 20°C are 380 Wm-1 K-1 and 5.67 × 107 -1 m-1 number.
respectively. Calculate the Lorentz number

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