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Help with interference question AH physics? exam tomorrow :(

  1. May 4, 2015 #1
    Could someone please explain this question to me I'll include what I thought the answer was and the actual SQA answers.

    Please can you read my answer just to see what I'm doing wrong and what I don't understand

    It's from the 2009 past paper AH physics

    Thanks so much I really appreciate any help smile.png exam tomorrow ;(



    1. The problem statement, all variables and given/known data

    attachment.jpg

    2. Relevant equations

    these are gien below in my attampt and in the SQA marking scheme included below


    3. The attempt at a solution
    attachment.jpg


    this is the answer given by sqa

    attachment.jpg


    thanks very very very much
     
  2. jcsd
  3. May 4, 2015 #2

    BvU

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    Science Advisor
    Homework Helper
    Gold Member

    Your 2 n t looks more like 4 n t and what you write down doesn't correspond to what you calculate.

    Furthermore, you and sqa both seem to know ##\lambda##. We don't.

    So: work a little less hasty, and you'll be just fine. Good luck tomorrow !
     
  4. May 4, 2015 #3

    sorry λ is 580nm

    thanks so much for ur reply
     
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