Official PYQ · 2026Set 1 · Q44MSQ2 marks

GATE EC 2026 Set 1 Q44 — Electronic Devices

Consider an LED based on a direct bandgap semiconductor material with energy bandgap $1.3$ eV.

Given: Plank's constant, $h=6.63 \times 10^{-34} \mathrm{~J} \mathrm{~s}$ and speed of light in free space is $3 \times 10^{8} \mathrm{~m} \mathrm{~s}^{-1}$ .

In which of the following wavelength ranges the LED will NOT emit?

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Answer: A;B;D

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Published 10 Oct 2026

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