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How many nodal lines

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  1. Oct 4, 2015 #1
    How many nodal lines are created by two point sources emitting at the same wavelength that are separated by a distance equal to 4.5*lambda?

    I used the equation 2(d/lambda) which in this case equals 9, but I've been told this is incorrect. Where have I gone wrong?
     
  2. jcsd
  3. Oct 4, 2015 #2

    mfb

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    Did you draw a sketch?
     
  4. Oct 4, 2015 #3
    yes, i drew a sketch and 9 nodal lines seems correct.
     
  5. Oct 4, 2015 #4

    mfb

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    Staff: Mentor

    Hmm... 9 looks correct if the two point sources emit in phase.
     
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