Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

B Sound Intensity Propagation and Sound Waves

  1. Dec 28, 2017 #1
    Hello everyone, I'd ask you through an illustration which for me would be more clear to put questions I wrote in the image:


    Thanks to all!
  2. jcsd
  3. Dec 28, 2017 #2


    User Avatar
    Science Advisor
    Homework Helper
    2017 Award

    Hello Luigi, :welcome:

    " Right ? " is not a good question to ask on PF. Just like "No" is not a good answer.

    Sound waves do not 'respond to a law'. We describe what we observe from spherical sound waves by what we call an inverse square law. And the explanation is that the surface of a wave front increases with the square of the distance to the source (*). So whatever disturbance it is that propagates outwards: when it is twice as far away it has to disturb four times as much. Far enough from the source the disturbance can not be distinguished from random noise any more.

    (*) the surface area of a sphere with radius ##r## is ##4\pi r^2##​
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted