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Interference in 2D (wavefronts)

  1. Jul 10, 2009 #1
    1. The problem statement, all variables and given/known data
    The figure shows the circular wave fronts emitted by two wave sources.


    Make a table with rows labeled P, Q, and R and columns labeled r1, r2, [tex]\Delta[/tex]r, and C/D. Fill in the table for points P, Q, and R, giving the distances as multiples of [tex]\lambda[/tex] and indicating, with a C or a D, whether the interference at that point is constructive or destructive

    2. Relevant equations
    no real formula, given, just count the rings in the wave front pattern


    3. The attempt at a solution
    so i got mostly everything except r2 for P and R...im thinking it should be 7/2[tex]\lambda[/tex] for both, but apparently its not...what am i doing wrong?
     

    Attached Files:

  2. jcsd
  3. Jul 10, 2009 #2

    Redbelly98

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    Welcome to Physics forums.

    Is the distance from "2" to the smallest ring equal to λ or λ/2?

    What did you get for r2 and Q, that was verified as correct?
     
  4. Jul 11, 2009 #3
    thanks a lot redbelly...i cant believe i missed that, but i do have another question regarding this question. I can see that the 2 sources are out of phase but the only explanation that I can give is that 2 in-phase sources emit circular or spherical waves and these 2 dont. Is that correct?
     
  5. Jul 11, 2009 #4

    Redbelly98

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    Not quite, out-of-phase point sources emit circular or spherical waves as well. It's just a matter of accounting for that phase difference when figuring out where there's constructive or destructive interference.
     
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