An LED is constructed from a p-n junction based on a certain Ga-As-P semiconducting material whose energy gap is 1.9 eV. What is the wavelength of the emitted light in nm?

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Detailed Solution

Energy gap of semiconductor : Eg=hcλ∴Wavelength of emitted light : λ=hcEg =6.6×10-34×3×1081.9×1.6×10-19 m⇒λ = 6.5 ×10-7 m = 650 nm

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