1. Nov 6, 2011 #1

   bael

   

   I was wondering why photoelectric cells are evacuated

    

   bael, Nov 6, 2011
2. 
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3. Nov 7, 2011 #2

   Borek

   

   Staff: Mentor

   Think how they work.

    

   Borek, Nov 7, 2011
4. Nov 7, 2011 #3

   bael

   

   light of a certain frequency hits a metal and frees some electrons, which then travel toward the positive cathode.

    

   bael, Nov 7, 2011
5. Nov 7, 2011 #4

   Borek

   

   Staff: Mentor

   So far so good. Now think about the "travel towards the cathode part".

    

   Borek, Nov 7, 2011
6. Nov 7, 2011 #5

   bael

   

   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?

    

   bael, Nov 7, 2011
7. Nov 8, 2011 #6

   Borek

   

   Staff: Mentor

   More precisely "giving no reading".

    

   Borek, Nov 8, 2011

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