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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 × 10-34 Js and c = 3 × 108 ms-1]

Option 1 -

654nm and orange colour 

Option 2 -

1046nm and blue colour

Option 3 -

1046nm and red colour 

Option 4 -

654nm and red colour

0 7 Views | Posted 2 months ago
Asked by Shiksha User

  • 1 Answer

  • P

    Answered by

    Payal Gupta | Contributor-Level 10

    2 months ago
    Correct Option - 4


    Detailed Solution:

    λ=hcE=6.63×10−34×3×1081.9×1.6×10−19 = 654 nm (red)

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