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Cathode Ray Tube Question

  1. Jun 12, 2016 #1
    1. The problem statement, all variables and given/known data

    What 3 materials is the cathode coated with, from which the electron originate?
    2. Relevant equations
    None
    3. The attempt at a solution
    From what I managed to find, I think some may be nickel and barium but I'm not sure.
     
  2. jcsd
  3. Jun 12, 2016 #2

    Simon Bridge

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