LED is constructed from G a - A s - P semiconducting material. The energy gap of this LED is 1 . 9   eV…

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=6.63×10-34 J-s and c=3×108 m s-1
  1. 654 nm and red colour
  2. 654 nm and orange colour
  3. 1046 nm and red colour
  4. 1046 nm and blue colour

Solution

λ=hcE=6.6×10-34×3×1081.9×1.6×10-19=6.54×10-7

=654 nm

Red color

Asked in: JEE Main 2021 (26 Feb Shift 1)

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