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Question
An LED (Light Emitting Diode) is constructed from a p-n junction based on acertain Ga-As-P semi-conducting material whose energy gap is 1.9 eV. What is the wave length of the emitted light ?
Options
A.650 nm
B.65 
C.800 nm
D.8000
Solution
The wavelength of emitted light
λ =
where Eg = energy gape of semiconductor
   = 1.9eV
   = 1.9 × 1.6 × 10-19V
   λ =
= 6.5 × 10-7 m
= 650 × 10-9 m
= 650 nm
λ =
where Eg = energy gape of semiconductor
   = 1.9eV
   = 1.9 × 1.6 × 10-19V
   λ =
= 6.5 × 10-7 m
= 650 × 10-9 m
= 650 nm
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