Question: Verify the calculation that the London penetration depth in a realistic superconductor is very small, using the electron density n 0 = 10 20 cm

Verify the calculation that the London penetration depth in a realistic superconductor is very small, using the electron density n₀ = 10²⁰ cm⁻³and the mass and charge of an electron in vacuum (which is, of course, an approximation since electrons in a solid can have mass different from this.) Recall that the charge of the Cooper pairs is −2e, and find the exact value for λ_L in this case.

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