The gap between valence and conduction bands in diamond is 5.47 eV. (a) What is the maximum wavelength of a photon that can excite an electron from the top of the valence band into the conduction band? In what region of the electromagnetic spectrum does this photon lie? (b) Explain why pure diamond is transparent and colorless. (c) Most gem diamonds have a yellow color. Explain how impurities in the diamond can cause this color. | Numerade

The Band Gap Between the Valence and the Conduction Bands in Zinc Oxide (Zno) is 3.2 Ev. Suppose an Electron in the Conduction Band Combines with a Hole in the Valence Band - Physics | Shaalaa.com

The gap between valence and conduction bands in silicon is 1.12 eV . A nickel nucleus in an excited state emits a gamma-ray photon with wavelength 9.31 ×10^-4 nm. How many electrons can be excited from the top of the valence band to the bottom of the conduction band by the absorption of this gamma ray? | Numerade

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