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find the maximum wavelength of electromagnetic radiation which can create a hole-electron pair in germanium.The band gad in germanium os 0.65eV.

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Band gap` =0.65eV,lambda = ?`
`E = (hc)/(lambda)`
`lambda =(hc)/(E) = (1242)/(0.65)`
`= 1910.7xx10^(-9)m`
` = 1.9xx10^(-9)m`
` = 1.9xx10^(-6)m`
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