JEE Main 2024 Physics question
Not in JEE Advanced syllabus
A light emitting diode (LED) is fabricated using GaAs semiconducting material whose band gap is 1.42 eV. The wavelength of light emitted from the LED is:
Answer: (C)
Solution
λ = 1240 eV·nm/1.42 eV ≈ 875 nm.