1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Energy carried by Electromagnetic Waves

  1. Oct 31, 2008 #1
    1. The problem statement, all variables and given/known data
    An industrial laser is used to burn a hole through a piece of metal. The average density of the light is S = 1.24E9 W/m2. What is the rms value of each of the following fields in the electromagnetic wave emitted by the laser?


    2. Relevant equations
    S = ceoE2
    S = (c/uo)B2
    E=cB
    S is average density and E,B are rms values.

    3. The attempt at a solution
    Solving for E:
    sqrt(S/ceo) = E
    sqrt(1.24E9/(3e8 x 8.85E-12)) = E = 683405.7 N/C

    Solving for B:
    E = cB
    E/C = B
    4.67E11/3E8 = .00228T

    I have 5 tries to get this homework right and I'm down to my last one. I want to make sure I'm not leaving anything out this time. Any help is appreciated!
     
  2. jcsd
  3. Nov 1, 2008 #2

    Redbelly98

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    Looks good. You might need to watch the significant figures on the answer for E, they checked for that.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Energy carried by Electromagnetic Waves
Loading...