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Homework Help: Bands, Energy diagram in a diamond

  1. Oct 31, 2012 #1
    1. The problem statement, all variables and given/known data

    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) Use your calculations to explain why pure diamond is transparent
    and colourless.
    (c) Most gem diamonds have a yellow colour. Explain with the help of an
    energy diagram how impurities in the diamond can cause this colour.

    2. Relevant equations

    Don't know.

    3. The attempt at a solution

    Did not try yet as i don't know how to.
  2. jcsd
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