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The band gap between the valence and the...

The band gap between the valence and the conduction bands in zinc oxide `(ZnO)`is 3.0eV.Suppose an electron in the conduction band combines with a hole in the valence band and the excess energy is released in the form of electromagnetic radiation.Find the maximum wavelength that can be emitted in this process.

Text Solution

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Give Band gap `= 3.2eV`
`E = (hc)/(lambda) = (1242/(lambda )= 3.2`
`lambda = 388.1nm`
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