Which outcome occurs when electrons encounter a band gap?

💡 Explanation

When electrons encounter a band gap, the electron wavefunction becomes evanescent because electron energy is less than the gap energy; therefore, the electron cannot propagate, rather than reflecting directly, undergoing thermal excitation, or linearly shifting.

• Which outcome results when tensile stress misaligns grains in polycrystalline ceramics?
• Which mechanism causes increased brittleness in polycrystalline tungsten at its grain boundaries?
• Which outcome results when amplified spontaneous emission overwhelms a laser cavity?
• Which effect is magnified when constructing holographic data storage using highly coherent lasers?
• Which mechanism explains why radio wave signal weakens rapidly behind a large metal building?
• Which outcome occurs when parallel coherent light passes through double slits?