I was a bit confused on the dependence of the speed of sound on density. I know that the speed is usually indirectly related to the density, thats only if the materials have the same elastic properties though (i.e. you cant compare density of steel to rubber when comparing speed of sound, b/c the elastic properties are a greater determining factor in that case). but if you have two metals ,then the speed of sound is effected by density, the more dense metal would transmit sound slower because higher density= more mass in a given amount of volume, and it takes more kinetic energy to make the more massive molecules vibrate than the slow ones.. that all makes sense.
Now, the confusing part is when we're talking about density of AIR and its effect on speed of sound. The above relationship seems to reverse...in that the denser substance has more mass packed into a given amount of volume.. so the molecules are closer together and stronger, so sound would travel faster through the stronger bonds? This contradicts what i mentioned about the metals above.. Can anyone clarify this please? Also, should I just be thinking of speed of sound in air relative to temperature and not think in terms of density (only in air).. i.e. the higher temperature, warmer air has more kinetic energy to make the molecules vibrate so sound travels faster.. ?
Thanks!
Now, the confusing part is when we're talking about density of AIR and its effect on speed of sound. The above relationship seems to reverse...in that the denser substance has more mass packed into a given amount of volume.. so the molecules are closer together and stronger, so sound would travel faster through the stronger bonds? This contradicts what i mentioned about the metals above.. Can anyone clarify this please? Also, should I just be thinking of speed of sound in air relative to temperature and not think in terms of density (only in air).. i.e. the higher temperature, warmer air has more kinetic energy to make the molecules vibrate so sound travels faster.. ?
Thanks!