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LED is constructed from Ga-As-P semiconducting material. The energy gap of this LED is 1.9 eV. Calculate the wavelength of light emitted and its colour.
[ $h = 6.63 \times 10^{- 34}$ Js and $c = 3 \times 10^{8} m s^{- 1}$ ]

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654 nm and red colour

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detailed solution

Correct option is A

We know, hcλ=Egap ⇒λ=6.63×10−34×3×1081.9×1.6×10−19=6.54×10−7m =654 nm (Red)

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LED is constructed from Ga-As-P semiconducting material. The energy gap of this LED is 1.9 eV. Calculate the wavelength of light emitted and its colour. [h=6.63×10−34Js and c=3×108ms−1 ]

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Ready to Test Your Skills?

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LED is constructed from Ga-As-P semiconducting material. The energy gap of this LED is 1.9 eV. Calculate the wavelength of light emitted and its colour.
[ $h = 6.63 \times 10^{- 34}$ Js and $c = 3 \times 10^{8} m s^{- 1}$ ]