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Homework Help: P-N Junctions

  1. May 28, 2010 #1
    1. The problem statement, all variables and given/known data

    An LED is connected as shown (see attached)

    When switch S is closed:
    A. the p-n junction is reverse biased and free charge carriers are produced which may recombine to give quanta of radiation.
    B. the p-n junction is forward biased and positive and negative charge carriers are produced by the action of light.
    C. the p-n junction is reverse biased and positive and negative charge carriers are produced by the action of light.
    D. the p-n junction is forward biased and positive and negative charge carriers may recombine to give quanta of radiation
    E. the p-n junction is reverse biased and positive and negative charge carriers may recombine to give quanta of radiation.

    2. Relevant equations

    -

    3. The attempt at a solution

    Question came up on the multiple choice section in an exam, took a guess at E but was looking for a hint?

    Thanks in advance,
     
  2. jcsd
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