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In a photodiode,the conductivity increas...

In a photodiode,the conductivity increases when the material is exposed to light.It is found that the conductivity changes only if the wavelength is less than 620nm.What is the band gap?

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The band gap `E_(g)=(hc)/(lamda)=((6.63xx10^(-34))xx(3xx10^(8)))/(620xx10^(-9))`
`=3.2xx10^(19)J`
`=2.0eV`
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