Which mode occurs when a germanium crystal lattice contains arsenic impurities?

💡 Explanation

Increased electrical conductivity emerges in germanium doped with arsenic because the *electron donor effect* introduces free electrons into the conduction band; therefore, conductivity rises, rather than decreased thermal expansion which requires different conditions related to phonon behavior.

• Which mechanism limits sustained energy release in TNT?
• Which risk increases when an aircraft flies through an area of supercooled large water droplets (SLD)?
• Which effect occurs in a molecule when anti-bonding molecular orbitals are preferentially populated by electrons?
• Which outcome is driven by increased entropy during water electrolysis?
• Which consequence results when capacitive reactance drops sharply in an improperly shielded avionics field bus?
• Which problem arises due to polarization in fiber-optic communications?