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

question 2

Multiple Choice

The energy gap between the valence and conduction bands in a certain semiconductor is .What is the threshold wavelength for optical absorption in this substance? ,1 eV = 1.60 × 10^-19 J,h = 6.626 × 10^-34 J • s)

• A) 599 nm
• B) 639 nm
• C) 959 nm
• D) 873 nm
• E) 994 nm

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