Question

The gap between the valence and conduction bands of a certain semiconductor is 0.85 eV. When this semiconductor is used to form a light emitting diode, the wavelength of the light emitted: 

A. is in a range above 1.5 × 10⁻⁶ m 

B. is in a range below 1.5 × 10⁻⁶ m 

C. is always 1.5 × 10⁻⁶ m 

D. is in a range centered on 1.5 × 10⁻⁶ m 

E. has nothing to do with the gap

Answer 1

B. is in a range below 1.5 × 10⁻⁶ m