The Gap Between the Valence and Conduction Bands of a Certain

question 4

Multiple Choice

The gap between the valence and conduction bands of a certain semiconductor is 0.85eV.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

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