A light emitting diode emits light of approximate wavelength 670 nm. What is the band gap?
A)1.86 eV
B)4.14 eV
C)1.80 eV
D)3.72 eV
E)2.70 eV

Question

Quizplus · Accepted Answer

The energy of a photon is given by E = hc/λ, where h is Planck's constant (4.135667696 x 10^-15 eV·s), c is the speed of light (3 x 10^8 m/s), and λ is the wavelength (670 nm = 670 x 10^-9 m). Calculating this gives approximately 1.86 eV.

A Light Emitting Diode Emits Light of Approximate Wavelength 670