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Which outcome occurs when a silicon semiconductor's band gap absorbs photons?

A)Increased free carrier concentration
B)Decreased lattice vibrational energy
C)Reduced material refractive index
D)Localized thermal runaway hotspots

💡 Explanation

Excitation of electrons to higher energy levels via photon absorption results in increased conductivity, therefore free carrier concentration increases rather than reduced index, because promotion across the band gap via the electron-hole generation mechanism yields mobile carriers.

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