Calculating Material Bandgap Using Quantum Theory

[nanostar]

Quantum theory says that the energy, E , (in eV) of a photon of wavelength λ is E = hc/eλ, where h is Planck's Constant, c is the velocity of light and e is the charge on an electron. Calculate the bandgap of a material which absorbs electrons shorter than 500nm.

 

[kuruman]

What are your thoughts on this?

 

[GabbleRatchet]

This one's easy. Just plug in all the numbers and you have your bandgap. Then use the values for the next two parts to the question.