Speed of sound waves in various media.

  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. 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. Thx. That helped a lot.
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