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!

Electromagnetic wave striking a small pocket mirror

  1. May 18, 2009 #1
    1. The problem statement, all variables and given/known data
    a plane electromagnetic wave of intensity 6.00 W/m^2, moving in the x direction, strikes a small pocket mirror of area 40.0cm^2, held in the yz plane.
    (a) what momentum does the wave transfer to the mirror each second?
    (b) find the force that the wave exerted on the mirror?
    (c) explain the relationship between a and b


    2. Relevant equations
    I know how to get (b) and (c) but the first one is giving me the most trouble. I need help find U in order to get momentum from p= U/c


    3. The attempt at a solution

    given S I tried to calculate E and B to find Ue and Ub. I used I= E^2/2(mu)c arranged to be E= Sqrt and i used a few others to try to find U but nothing has been working. its telling me that the answer is 1.60 x 10^-10. im getting answers close to the answer but not the answer.
     
  2. jcsd
  3. May 19, 2009 #2

    Doc Al

    User Avatar

    Staff: Mentor

    How does energy flux (S) relate to momentum flux?
     
  4. May 19, 2009 #3
    I meant I
     
  5. May 20, 2009 #4

    Doc Al

    User Avatar

    Staff: Mentor

    Same thing. How does energy relate to momentum for an EM wave?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Electromagnetic wave striking a small pocket mirror
  1. Electromagnetic waves (Replies: 9)

  2. Electromagnetic Waves (Replies: 3)

  3. Electromagnetic Waves (Replies: 9)

  4. Electromagnetic Waves (Replies: 2)

Loading...