Find the maximum wavelength of electromagnetic radiation which can create hole -electron pair in germanium. Give that Forbidden energy gap in Germanium is 0.72eV.

energy gap = hcλ = 6.6×10-34×3×108λ0.72×1.6×10-19 = 6.6×10-34×3×108λλ =  6.6×10-34×3×1080.72×1.6×10-19 =17.1875×10-7 m =1718 nm 

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