Question on sound - anyone?

[drareg]

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speed of sound at 0 C is 331.3 m/s
at diff temp
v = 331.3 + 0.606 C
C= degrees C

according to that sound velocity increases with temperature but a temperature change of 10,000 degrees will turn most substances from solid to gas, and we know that sound propogates faster through a solid than a gas. so according to this statement as temperature increases then velocity decreases

can anyone clarify?

 

[MD2BEEE]

Not 100%, but I'm going to go ahead and say that that's only valid within a gas state, since the speed of sound is dependent upon the speed of the molecules in the gas state. Temperature is not as important in other mediums, for example solids where bulk modulus plays a much larger role. So, it works as long as you're increasing the temperature of a gas.

Anyone else?

 

[rocketbooster]

Not 100%, but I'm going to go ahead and say that that's only valid within a gas state, since the speed of sound is dependent upon the speed of the molecules in the gas state. So, it works as long as you're increasing the temperature of a gas.

Anyone else?

yep, that's right.

 

[drareg]

yep, that's right.

great, thanks alot guys!

 

[BerkReviewTeach]

speed of sound at 0 C is 331.3 m/s
at diff temp
v = 331.3 + 0.606 C
C= degrees C

according to that sound velocity increases with temperature but a temperature change of 10,000 degrees will turn most substances from solid to gas, and we know that sound propogates faster through a solid than a gas. so according to this statement as temperature increases then velocity decreases

can anyone clarify?

You should note that the speed of sound you list is for the speed of sound in air. Just as you suspected, it applies to air in the gaseous state.

As a point of interest, the speed of sound at 0C is 331.3 in air only, and will be slower in heavier gases and faster in lighter gases. The speed of sound depends on the speed of the gas particles, so be careful on questions like these.

 

[JJMrK]

Not 100%, but I'm going to go ahead and say that that's only valid within a gas state, since the speed of sound is dependent upon the speed of the molecules in the gas state. Temperature is not as important in other mediums, for example solids where bulk modulus plays a much larger role. So, it works as long as you're increasing the temperature of a gas.

Anyone else?

That sounds right to me too. The equation is only relevant to a pretty specific situation.

 

[n618ft]

I remember by remembering that it's easier to break the sound barrier at high altitude. When the X1/Chuck Yeager broke it in '47 (i think that was the year), he was at a very high altitude... cold enough to offset the density decrease. In other words, Mach 1 (speed of sound x 1) is a slower relative speed at altitude than near the ground because of the decrease in temperature.

 

[Studoc20]

Yes and the sound waves are also refracted in hot air