The energy band gap of semiconducting material to produce violet (wavelength = 4000) LED is ______________ eV. (Round off to the nearest integer). Numerical answer type. Work it out, then open the answer.

Answer: 3. Eg = (hc)/(λ), with hc ≈ 12400 eV Å. Eg = (12400)/(4000) = 3.1 eV Nearest integer: 3 eV.

The energy band gap of semiconducting material to produce violet… | JEE Main 2022 (25 Jul, Shift 1)

Q51JEE Main 2022 · 25 JUL · SHIFT 1Easy

Special Purpose Diodes

The energy band gap of semiconducting material to produce violet (wavelength = 4000 $\text{\AA}$ ) LED is ______________ $\text{eV}$ . (Round off to the nearest integer).

Numerical answer type. Work it out, then open the answer.

Show answer and solution

Answer: 3

$E_g = \dfrac{hc}{\lambda}$ , with $hc \approx 12400$ eV Å.
$E_g = \dfrac{12400}{4000} = 3.1$ eV
Nearest integer: $3$ eV.

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