Kizspy | Question: 32
(Choose 1 answer)
FUSTER LOW LOW
In a semiconductor, optical absorption occurs when:
A. Electrons are excited from the conduction band to the valence band
B. Photons have energy equal to or greater than the band gap energy
C. Photons with energy below the band gap cause electron motion
D. Electrons are excited from the valence band to the conduction band without any change in energy
