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Sound waves (node and antinodes)

  1. Jun 6, 2014 #1
    1. The problem statement, all variables and given/known data

    for part a , since we know that the sand particles will vibrate will max amplitude at antinode and the displacement of partcles is 0 at node. then , the sand should heap at antinode . why the solution gives the sand heap at nodes?

    2. Relevant equations



    3. The attempt at a solution
     

    Attached Files:

  2. jcsd
  3. Jun 6, 2014 #2

    ehild

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    The standing sound wave means that the air vibrates with high amplitude at the antinodes, and moves with high speed there. At the nodes, the air is in rest. The air flow takes the dust particles with itself, sets them into motion. It is like the broom sweeping dust or leaves. Watch video, especially from the 10th second. Where do the dust particles (leaves) accumulate? https://www.youtube.com/watch?v=iM_YIMC6Ic4

    ehild
     
  4. Jun 6, 2014 #3
    ok, can understand it finally.
     
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