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Homework Help: Railroad track and sound waves

  1. Apr 16, 2009 #1
    1. The problem statement, all variables and given/known data
    People put their ears to a railroad track to get an early warning of an approaching train. why did this work.

    2. Relevant equations
    written response.

    3. The attempt at a solution
    Sound waves can travel a long way along an undisturbed metal rod?
  2. jcsd
  3. Apr 17, 2009 #2


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    The rod has to be disturbed for any sound to be carried along it. Apart from travelling a long way in the rail, what other property does sound have in the metal that is greater than in air that would be an advantage?
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