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Friday, April 16, 2010

Question 25.44 Mastering Physics

The question asks:

What is the maximum value of the electric field in an electromagnetic wave whose maximum intensity is 5.50 {\rm W/m^{2}}?
I know that I=C*e_o*E^2

(e_o is my way of saying epsilon not)

So I rearranged to solve for E

E=sqrt(I/c*e_o)

The answer I get is 45.5.... but its not correct?

Any Suggestions?
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5 comments:

  1. cherylApril 16, 2010 at 11:44 PM

    my max was 3.0 W/m^2

    i used the same formula and got 33.6, but it was incorrect too. =(

    ReplyDelete
  2. e.michaelaApril 17, 2010 at 7:59 PM

    i had the same problem too

    ReplyDelete
  3. mlmMETALLICAmlmApril 17, 2010 at 8:12 PM

    the equation Lauren used is correct except the E in the equation is in reality E_rms. So you have to think about how E_rms and E_max relate.

    ReplyDelete
  4. KulsoomApril 17, 2010 at 8:39 PM

    i had the same problem. in the textbook it says that the relationship between Emax and Erms is that Erms = Emax/sqrt(2)

    ReplyDelete
  5. KulsoomApril 17, 2010 at 8:41 PM

    so if its Erms in the equation, then you would just multiply the Erms by sqrt(2)

    ReplyDelete

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