Question

The energy band gap of semiconducting material to produce violet (wavelength = 4000 Å).

LED is ______ eV. (Round off to the nearest integer)

Options

• 1

• 2

• 3

• 4

Answer 1

The energy band gap of semiconducting material to produce violet (wavelength = 4000 Å).

LED is 3 eV. (Round off to the nearest integer)

Explanation:

E (eV) = `12400/(lambda(Å)) = 12400/4000` ≃ 3 eV