Railroad track and sound waves

  • Thread starter m.l.
  • Start date
  • #1
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Homework Statement


People put their ears to a railroad track to get an early warning of an approaching train. why did this work.


Homework Equations


written response.


The Attempt at a Solution


Sound waves can travel a long way along an undisturbed metal rod?
 

Answers and Replies

  • #2
Kurdt
Staff Emeritus
Science Advisor
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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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