Primarygun Posted April 7, 2005 Share Posted April 7, 2005 Which of the sound wave travels at a higher speed? In air, In carbon dioxide. Link to comment Share on other sites More sharing options...
Ophiolite Posted April 7, 2005 Share Posted April 7, 2005 What is the air pressure? What is the carbon dioxide pressure? Is that enough of a hint? Link to comment Share on other sites More sharing options...
YT2095 Posted April 7, 2005 Share Posted April 7, 2005 Yup, it`s all about Density, the more Dense a material (gas in this instance) the faster sound waves will propagate Link to comment Share on other sites More sharing options...
Primarygun Posted April 7, 2005 Author Share Posted April 7, 2005 I don't know. Someone told me that it travels faster in air. Link to comment Share on other sites More sharing options...
Asimov Pupil Posted April 9, 2005 Share Posted April 9, 2005 density,density,density it's the same as steel and helium! Link to comment Share on other sites More sharing options...
Mokele Posted April 10, 2005 Share Posted April 10, 2005 Speed of sound = (gamma*R*T)^1/2 Where T is temp, R is the ideal gas constant, and gamma is a property of the material, the nature of which I've completely forgotten. You look it up in tables in the back of the book. Pressure and density are involved because P= (density)*RT, and that can be re-arranged and substituted into the equation. Mokele Link to comment Share on other sites More sharing options...
The Thing Posted April 10, 2005 Share Posted April 10, 2005 Sound waves are transverse waves, which means that they, unlike electromagnetic waves, require the movements of particles to carry it across. It is the compression of particles and the de-compression of them. Now, as we all know, in solids, or in denser materials, the particles are more packed, which means that they will compress and de-compress easier cuz they are right beside each other, and thus carry the transverse wave across faster. And in low density gases the particles are far apart, thus making the wave travel slower. Sound travels in, say, steel many times faster than it does in the air. (think how people putting a stick in their teeth and the other end on the railroad to test to see if any train is apporaching). Link to comment Share on other sites More sharing options...
Primarygun Posted April 10, 2005 Author Share Posted April 10, 2005 Sound waves are transverse waves Sound waves are longitudinal waves. Link to comment Share on other sites More sharing options...
Janus Posted April 10, 2005 Share Posted April 10, 2005 As stated above, the speed of sound in a gas is: [math]v= \sqrt{\gamma R T}[/math] Gamma is the Ratio of specific heats R in the gas constant T is the Temp in Kelvin. For air: Gamma = 1.4 R = 286 For CO2: Gamma = 1.3 R= 189 From this it is obvious that sound travels faster in air. (330 m/s vs 259 m/s at 0 degrees C) Link to comment Share on other sites More sharing options...
Primarygun Posted April 12, 2005 Author Share Posted April 12, 2005 Thank you very much. For air: Gamma = 1.4 R = 286 For CO2: Gamma = 1.3 R= 189 What is a probable reason for this observation? Sound wave travel slower in CO2 than air only? How about other gases, such as Hydrogen? Link to comment Share on other sites More sharing options...
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