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The enrgy gap of silicon is 1.14 eV.Find...

The enrgy gap of silicon is 1.14 eV.Find the maximum wavelength ,at which silicon starts energy absorption.Give that `1 eV=1.6 10^(-19) J` and `h=6.62 xx 10^(-34) J s`.

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`E_(g)= 1.14eV= 1.14 xx 1.6 xx 10^(-19)J`
`lamda=`?
`h= 6.62 xx 10^(-34)Js`
`c= 3 xx 10^(8) ms^(-1)`
`E_(g)= (hc)/(lamda)`
`lamda= (hc)/(E_(g)) = (6.62 xx 10^(-34) xx 3 xx 10^(8))/(1.14 xx 1.6 xx 10^(-19))`
`lamda= 10.89 xx 10^(-7)m`
`=1.089 xx 10^(-6)m= 1.089 mu m`
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