Question

A light-emitting diode (LED) is fabricated using GaAs semiconductor material whose band gap is \( 1.42 \, \text{eV} \). The wavelength of light emitted from the LED is:

• A. \( 650 \, \text{nm} \)
• B. \( 1243 \, \text{nm} \)
• C. \( 875 \, \text{nm} \)
• D. \( 1400 \, \text{nm} \)

Hint:

The wavelength of light emitted by a semiconductor is inversely related to its band gap energy \( E_g \). A smaller band gap corresponds to a longer wavelength, and vice versa.