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If the energy of a photon of sodium ligh...

If the energy of a photon of sodium light `(lambda=589 nm)` equals the band gap of a semiconductor, calculate the minimum energy required to create hole-electron pair.

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`E=E_g=(hc)/(lambda)=(6.6xx10^(-34)xx3xx10^(8))/(589xx10^(-9))J`
`=(6.6xx3xx10^(-17))/(589xx1.6xx10^(-19))eV, E=2.1eV`
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