Semiconductors

JEE Main level, numerical answer, medium

9 of 209

Question 9 of 209

The energy band gap of semiconducting material to produce violet (wavelength =4000Å=4000Å) LED is _____ eVeV. (Round off to the nearest integer).

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Answer: 3

Energy gap of semiconducting material Eg=hcλ=1242λ(nm)=1242400=3.105{E}_{g}=\dfrac{hc}{\lambda }=\dfrac{1242}{\lambda \left(nm\right)}=\dfrac{1242}{400}=3.105
Answer rounded to 3eV3eV.

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