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Question

An LED is constructed from a pn junction based on a certain semi-conducting material whose energy gap is 1.9 eV. Then the wavelength of the emitted light is
  1. 2.9×109m
  2. 1.6×108m
  3. 6.5×107m
  4. 9.1×105m

A
1.6×108m
B
9.1×105m
C
2.9×109m
D
6.5×107m
Solution
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Energy gap Eg=1.9eV
Wavelength of light emitted λ=hcEg nm where hc=1240eV
λ=12401.9650 nm =6.5×107 m

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