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Photoelectic cell

  1. Nov 6, 2011 #1
    I was wondering why photoelectric cells are evacuated
     
  2. jcsd
  3. Nov 7, 2011 #2

    Borek

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    Staff: Mentor

    Think how they work.
     
  4. Nov 7, 2011 #3
    light of a certain frequency hits a metal and frees some electrons, which then travel toward the positive cathode.
     
  5. Nov 7, 2011 #4

    Borek

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    Staff: Mentor

    So far so good. Now think about the "travel towards the cathode part".
     
  6. Nov 7, 2011 #5
    is it because the electrons could possibly collide with the oxygen and other electronegative gases, ionizing them and thus giving a smaller reading on the current meter?
     
  7. Nov 8, 2011 #6

    Borek

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    Staff: Mentor

    More precisely "giving no reading".
     
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