Light-Emitting Diodes Contain Semiconductors That Emit Light When a Current

Multiple Choice

Light-emitting diodes contain semiconductors that emit light when a current is passed through them.What is the key factor in determining the wavelength of the emitted light in an LED?

A) the width of the valence band
B) the width of the conduction band
C) the width of the band gap
D) the magnitude of the current
E) the type of semiconductor p vs.n)