2. The band gap for bulk silicon is 1.1 electron-volts. (a) Light of what wavelength is associated with this band gap? In what region of the electromagnetic spectrum is such light found? (b) Silicon is a semiconductor. Would the band gap be larger or smaller for an insulator? Would the wavelength be larger or smaller for an insulator? (c) This band gap is valid for BULK silicon. Would the band gap be larger or smaller for a quantum dot made of silicon? Would the wavelength be larger or smaller for a quantum dot made of silicon?