The Energy Gap Between the Valence and Conduction Bands in a Certain

question 10

Multiple Choice

The energy gap between the valence and conduction bands in a certain semiconductor is $1.25 \mathrm { eV }$ . What is the threshold wavelength for optical absorption in this substance? $\left( c = 3.00 \times 10 ^ { 8 } \mathrm {~m} / \mathrm { s } , h = \right.$ $6.626 \times 10 ^ { - 34 } \mathrm {~J} \cdot \mathrm { s }$ )

• A) \(994 \mathrm {~nm}\)
• B) \(873 \mathrm {~nm}\)
• C) \(599 \mathrm {~nm}\)
• D) \(959 \mathrm {~nm}\)

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