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Homework Help: Change in medium and its effect on sound

  1. Sep 2, 2015 #1


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    my question is just that how does the wavelength and frequency of sound wave change when it travels from rarer to a denser medium ...................................
    and whatever is your solution please give a briefer insight into it..

    i was recently going through a physics olympiad paper and i found from a question that when the above type of transition occurs ; from rarer to denser medium , the wavelength of the sound wave increases..

    please assist!!
    thanks in advance!!
  2. jcsd
  3. Sep 2, 2015 #2
    What happens to the speed of sound in a denser medium?

    What equation relates speed, frequency, and wavelength?
  4. Sep 2, 2015 #3


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    the speed of sound increases.....................
    but does it increase due to an increase in frequency or wavelength and how?
  5. Sep 3, 2015 #4


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    How would it be possible for the frequency to change?
  6. Sep 3, 2015 #5


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    yes , you are right
    the frequency doesnt change for a given enegy input in diffrent media....................
    so it must be the wavelenth that causes the increase in speed in denser media...........
  7. Sep 3, 2015 #6
    I think of it the other way around. Consider a line of people at an airport with a "people-mover" (horizontal conveyor). On the floor, they pass you at a frequency of 1/s, and all walk at 1m/s. They step on the conveyor, which moves at 1m/s relative to the floor, while maintaining their 1m/s relative to the conveyor. You stand stationary on the floor next to the conveyor. What is their speed? What is their frequency? What is their "wavelength" (spacing)? Think about it.
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