Speed of Sound in Air
Below is
an interactive table that will calculate the speed of sound at various temperatures.
It was created by:
http://hyperphysics.phy-astr.gsu.edu/hbase/sound/souspe.html#c1
The speed of sound in dry air is given approximately by
where TC is the celsius temperature,
"This calculation is usually accurate enough,
but for great precision one must examine the more general relationship
for sound
speed in gases. This sound speed does not apply to gases other than air,
for example the helium from a balloon.It is
important to note that the sound speed in air is determined by the air itself.
It is not
dependent upon the sound amplitude, frequency or wavelength." http://hyperphysics.phyastr.gsu.edu/hbase/sound/souspe.html#c1
Typical values for elastic modulus:
Aluminum 7.0*10^10, Steel 20*10^10, Copper 11*10^10, Brass 9.1*10^10
Densities of Various Substances: (10^3 kg/m^3)
Cooper 8.92, Air 0.0012, Aluminum 2.70
Serway*Beichner Physics for scientists and Engineers
|
The speed of sound in air is a function of the
temperature, although the speed of a wave is given by the product of its
wavelength and the frequency, it is not affected by the charges in either
one.
Serway*Beichner Physics for scientists and Engineers
For example, if the sound from a musical
instrument increases in frequency the wavelength decreases, so velocity
remains
constant. The amplitude of a sound wave determines the size of oscillations
of air molecules. Which does now affect the speed of the wave through
the air.
Speed of sound in a solid
v=sq root (Y/p)
Y=Young's Modulus (N/m^2) for a substance
p=Densities of various substances |