Tagged Questions
3
votes
2answers
133 views
How to relate speed of sound with relative humidity?
I am exploring the idea of measuring the humidity of a space using sound waves, however I am having trouble finding a mathematical relationship between the speed of sound and the humidity level.
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7
votes
2answers
407 views
Is it possible to travel at precisely the speed of sound?
I've been talking to a friend, and he said that it's impossible to travel at exactly the same speed as the speed of sound is. He argued that it's only possible to break through the sound barrier using ...
4
votes
1answer
509 views
The speed of sound is proportional to the square root of absolute temperature. What happens at extremely high temperatures?
The speed cannot increase unboundedly of course, so what happens?
6
votes
1answer
2k views
How does one derive the equation for the speed of sound?
In my acoustics books I see
$$c^2 = \frac{\mathrm{d}P}{\mathrm{d}\rho}$$
where $c$ is the speed of sound, $P$ is the pressure and $\rho$ is the density. Where does this equation come from? In my ...
2
votes
1answer
240 views
Laws of aerodynamics after breaking the sound barrier
my knowledge of physics is not very extensive, so I hope my question isn't too stupid.
I know that when (for instance) a plane breaks trough the sound barrier, the laws of the aerodynamics change.
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7
votes
1answer
268 views
Riddle about speed
This stems from a riddle I read in a magazine perhaps 20 years ago so I apologise for the imprecise recollection.
A dog that can run infinitely fast is placed on an infinitely large flat surface and ...
5
votes
2answers
755 views
How to compute the speed of sound in relativistic hydrodynamic?
In Weinberg: Gravitation and Cosmology chapter 2.10 (Relativistic Hydrodynamics) the speed of sound is derived as
$v_s^2 = \left(\frac{\partial p}{\partial \rho}\right)$
and the equation of state ...
