The longest wavelength that can be absorbed by silicon, which has a band gap of 1.12 eV, is approximately 1.1 μm. If the longest wavelength that can be absorbed by another material is 0.87 μm, then the band gap of this material is approximately

Calculate the approximate wavelength (λ) of radiation emitted by an LED made of a semiconductor material with a band gap energy of 3.2 eV. (Take hc ≈ 1240 eV·nm or 12400 eV·Å)

In a semiconductor material, an electron's effective mass (m) is 0.067 times the free electron mass (me ≈ 9.11 × 10-31 kg). If the electron is subjected to a force of 2 × 10-19 N, what will be its acceleration?