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Speed of sound waves in various media.

  1. Feb 20, 2014 #1
    My tenth grade physics textbook says that sound travels faster in solids than air. But it also says sound will travel faster in air if its density decreases. I didn't really get the logic, as solids are denser than air, and that is why sound travels faster. Then they say as temperature of air increases , sound will travel faster in it as its density decreases. Can anyone please explain this? They have also given this formula: Velocity of sound ImageUploadedByPhysics Forums1392908664.280183.jpg = root of elasticity divided by root of density of medium.
  2. jcsd
  3. Feb 20, 2014 #2
    according to the given equation, V= √(E/d) a lower density will give you a bigger number under the radical and hence a bigger velocity.

    but in regards to your confusion of higher density = faster speed of sound and lower density = lower speed of sound - this is untrue, its not the density is not directly proportional to the speed of sound, but the tension is directly proportional to the speed of sound, here is a thread that discusses in more detail: https://www.physicsforums.com/showthread.php?t=206667
  4. Feb 20, 2014 #3
    Thx. That helped a lot.
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