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

question 4

Multiple Choice

Light-emitting diodes are semiconductors that emit light when a current is passed through them. What is the key factor that must be changed to change 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)

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