Question
The energy band gap of semiconducting material to produce violet (wavelength = 4000$\mathop A\limits^o $ ) LED is ______________ $\mathrm{eV}$. (Round off to the nearest integer).
Correct Answer
3
The energy band gap of semiconducting material to produce violet (wavelength = 4000$\mathop A\limits^o $ ) LED is ______________ $\mathrm{eV}$. (Round off to the nearest integer).