The band gap of indium gallium arsenide varies based on the concentration of gallium in the material. A sample of InGaAs absorbs light with a wavelength less than 1.37 microns. What is the band gap of the InGaAs sample in eV

Answer 1

Isn't that just E = hc/wavelength
E in joules; convert to eV.
wavelength must be converted to meters.

Answer 2

thank you, drbob, i got it now