The energy of a photon of sodium light `(lambda=589 nm)`equal the band gap of a semiconducting material.(a)Find the minimum energy E requried to create a hole-electron pair.(b)Find the value of `E//kT`at a temperature of 300K.

The energy of a photon of sodium light `(lambda=589 nm)`equal the band

1.	The energy of a photon of sodium light `(lambda=589 nm)`equal the band gap of a semiconducting material.(a)Find the minimum energy E requried to create a hole-electron pair.(b)Find the value of `E//kT`at a temperature of 300K.
Answer» (a) `E=(hc)/(lambda)=(1242)/(589)=2.1eV` (b) `(E)/(kT)=(2.1xx1.6xx10^(-19))/(1.38xx10^(-23)xx300)=81` It is difficult for the thermal energy to create the hole-electron pair but a photon of light can do it easily.

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The energy of a photon of sodium light `(lambda=589 nm)`equal the band gap of a semiconducting material.(a)Find the minimum energy E requried to create a hole-electron pair.(b)Find the value of `E//kT`at a temperature of 300K.

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