Physics · 2021
JEE Main · 26 February 2021, Shift 1 · Q20
LED is constructed from Ga-As-P semiconducting material. The energy gap of this LED is 1.9 eV. Calculate the wavelength of light emitted and its…
LED is constructed from Ga-As-P semiconducting material. The energy gap of this LED is $\displaystyle 1.9$ eV . Calculate the wavelength of light emitted and its colour.
$$\left[\mathrm{h}=6.63 \times 10^{-34} \mathrm{Js} \text { and } \mathrm{c}=3 \times 10^8 \mathrm{~ms}^{-1}\right]
$$
Official answer
(1)
$\displaystyle 654$ nm and red colour
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JEE Main 2021 Physics question, with the answer from NTA’s final answer key. Where our answers come from.