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A p-n junction diode is made up of a material which has energy gap of 3.0 eV. The maximum wavelength of radiation that can be absorbed by the material is nearly equal to
  1. 5426 A
  2. 4140 A
  3. 6216 A
  4. 3146 A


Solution

The correct option is B 4140 A
Given energy gap is 3 eV
hν=3 eV
hcλ=3×1.6×1019 
(hc20×1026)
λ=20×10264.8×1019
λ=4140A

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