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Power and Electric Field problem

  1. Dec 12, 2011 #1
    1. The problem statement, all variables and given/known data

    The peak electric field produced by the raditation at a distance of 2m is 2.5V/m. What is the power of the light source?

    2. Relevant equations

    no clue

    3. The attempt at a solution

    no clue
     
  2. jcsd
  3. Dec 12, 2011 #2

    Delphi51

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    Homework Helper

    Take a look at this
    http://electron9.phys.utk.edu/phys135d/modules/m10/emwaves.htm [Broken]
    down to "magnitude of the energy flux S" where it gives the energy of the electromagnetic wave per square meter per second in terms of E.

    If you don't know otherwise, I would assume the source radiates in all directions so the power of the lights source is spread over an expanding sphere.
     
    Last edited by a moderator: May 5, 2017
  4. Dec 14, 2011 #3
    Hello!
    Thanks a bunch, it really helped.
     
    Last edited by a moderator: May 5, 2017
  5. Dec 14, 2011 #4

    Delphi51

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    Homework Helper

    Most welcome! Wikipedia is powerfully helpful.
     
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