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Find the maximum wavelength of electromagnetic radiation which can create a hole—electron pair in germanium.

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Find the maximum wavelength of electromagnetic radiation which can create a hole—electron pair in germanium. The band gap in germanium is 0.65 eV.

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Band Gap = 0.65 eV, λ =?

E = hc /λ = 1242 / 0.65 = 1910.7 x 10–9 m = 1.9 x10–5 m.

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