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Making Carbon 12

  1. Dec 8, 2008 #1
    1. The problem statement, all variables and given/known data
    A typical electromagnetic signal from a communications satellite might have an intensity of 0.9 pW/m2 at the surface of the Earth. Your satellite dish collects the energy of the electromagnetic signal from the satellite; then your dish passes that energy to its central receiver, where the signal can be processed by a circuit. The area of a satellite dish can be calculated from pi (3.1416) times the radius squared. If your satellite dish has a radius of 0.36 m, and if it is receiving the signal described above, how much electromagnetic energy is reflected to the central receiver in 2.5 minutes? Express in pj and MeV


    2. Relevant equations



    3. The attempt at a solution
    I tried solving this but im not sure what equation to use.
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Dec 9, 2008 #2

    Mentallic

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    How about energy=power*time?

    Total power input = power of signal * area

    sorry that I don't know the actual proper formulas, I'm just using common sense here.
     
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