Question: Sn and Pb have T c = 3.7 K and 7.2 K respectively. When illuminated with far-IR radiation, they show a marked drop in reflectivity

Sn and Pb have T_c = 3.7 K and 7.2 K respectively. When illuminated with far-IR radiation, they show a marked drop in reflectivity at frequencies of ~10 and ~20 cm⁻¹, respectively. Rationalize these observations.

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