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  4. The energy band gap of semiconducting material to produce violet (wavelength = 4000 mathringA ) LED is eV. (Round off to the nearest integer).

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

JEE MainJEE Main 2022Dual Nature of Radiation and Matter

Solution:

$E _{ g }=\frac{ hc }{\lambda}=\frac{1242}{\lambda( nm )}=\frac{1242}{400}=3.105$
Answer rounded to $3\, eV$