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Q.

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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a

654 nm and red colour

b

1046 nm and blue colour

c

654 nm and orange colour

d

1046 nm and red colour

answer is A.

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Detailed Solution

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 ]