Asked by Lena
The question said find the speed of sound at a certain temperature. What formula would you use?
Could someone tell me the formula so I could do the questions that correspond.
Could someone tell me the formula so I could do the questions that correspond.
Answers
Answered by
drwls
It depends upon the gas as well as the temperature. Do they want the speed in air.
The accurate formula for air is
V = sqrt(1.4 RT/M)
where T is the absolute temperature, R is the molar gas constant (8.317 J/mole K, and M is the molecular weight. (Use M = 0.029 kg/mole for air)
With those units, V will be in m/s
For a limited range of temperture, there are simpler linearized equations for the speed of sound. You can easily find them online. Some are at
http://en.wikipedia.org/wiki/Speed_of_sound
The accurate formula for air is
V = sqrt(1.4 RT/M)
where T is the absolute temperature, R is the molar gas constant (8.317 J/mole K, and M is the molecular weight. (Use M = 0.029 kg/mole for air)
With those units, V will be in m/s
For a limited range of temperture, there are simpler linearized equations for the speed of sound. You can easily find them online. Some are at
http://en.wikipedia.org/wiki/Speed_of_sound
Answered by
Lena
Thank you :)
Answered by
drwls
The "1.4" in that formula has more that two significant figures. It is exactly the fraction 7/5, a result that can be derived from thermodynamics of diatomic gases. For monatomic gases the value of the constant is 5/3.
There are no AI answers yet. The ability to request AI answers is coming soon!
Submit Your Answer
We prioritize human answers over AI answers.
If you are human, and you can answer this question, please submit your answer.