Railroad track and sound waves

  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. Kurdt

    Kurdt 4,851
    Staff Emeritus
    Science Advisor
    Gold Member

    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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