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A photodetector is made of a compound se...

A photodetector is made of a compound semiconductor with the band gap of 0.73eV. The maximum wavelength it can detect is

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The maximum wavelength`(lambda)`, which a photodiode , which a photodiode can detect corresponds to the energy `E_(g).So h_(c)/lambda=E_(g)`,or `lambda=h_(c)/E_(g)=(6.63xx10^(-34)xx (3xx10^(8)))/(0.73xx1.6xx10^(-19))`=`1703xx 10^(-9)m=1703nm`
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