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Waves and sound

  1. Apr 17, 2016 #1
    1. The problem statement, all variables and given/known data
    a)a stationary railroad whistle is sounded. An echo is heard 4.0 seconds later by a train's engineer. If the speed of sound is 343 m/s, how far away is the reflecting surface?
    b) If the temperature of the air increased, how would this change your answer?

    2. Relevant equations
    d=rt
    x=xt/2
    3. The attempt at a solution
    I got part a right. x=(343*4)/2 =686 because the sound has to travel twice
    I do not know part b
     
  2. jcsd
  3. Apr 17, 2016 #2

    berkeman

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    Staff: Mentor

    Welcome to the PF.

    How does the speed of sound in air change with a change in air temperature? :smile:
     
  4. Apr 17, 2016 #3
    Higher the temperature faster the speed of sound. Thanks!
     
  5. Apr 17, 2016 #4

    berkeman

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    Staff: Mentor

    Really? That may be true, but it's counter-intuitive for me. Do you have a link to a reference that says that? :smile:
     
  6. Apr 17, 2016 #5
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