Asked by comet
The density of a sample of air is 1.157 kg/m3, and the bulk modulus is 1.42 · 105 N/m2.
a) Find the speed of sound in the air sample. -----> I found it 350.3 m/s and its correct.
b) Find the temperature of the air sample. Give answer in °C. ----> I cant find this :S
Can you help me, please?
a) Find the speed of sound in the air sample. -----> I found it 350.3 m/s and its correct.
b) Find the temperature of the air sample. Give answer in °C. ----> I cant find this :S
Can you help me, please?
Answers
Answered by
Count Iblis
The bulk modulus K used here is the so-called adiabatic bulk modulus and this is related to the pressure P according to:
K = gamma P
where gamma = cp/cv = approximately 1.4 for air.
So, you know the pressure and the density and then you can find the temperature via the ideal gas law.
K = gamma P
where gamma = cp/cv = approximately 1.4 for air.
So, you know the pressure and the density and then you can find the temperature via the ideal gas law.
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