The maximum wavelength of light that a certain silicon photocell can detect is 1.11 mm. (a) What is the energy gap (in electron volts) between the valence and conduction bands for this photocell? (b) Explain why pure silicon is opaque.

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The maximum wavelength of light that a certain silicon photocell can detect is 1.11 mm.

(a) What is the energy gap (in electron volts) between the valence and conduction bands for this photocell?

(b) Explain why pure silicon is opaque.

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