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Physics · PYQ NEET UG 2019(2)
हिन्दीAn LED is constructed from a p-n junction diode using GaAsP. The energy gap is \( 1.9\text{ eV} \). The wavelength of the light emitted will be equal to
Correct answer · Option 3
\( 654\text{ nm} \)
Explanation
Using \( \lambda = \frac{hc}{E} = \frac{12400\text{ eV}\cdot\text{Å}}{1.9\text{ eV}} \approx 6526\text{ Å} = 652.6\text{ nm} \approx 654\text{ nm} \).
