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what is the effect of density, humidity, pressure, temperature on velocity of sound waves?

Humidity decides the number of water molecules in air. Speed of sound is directly proportional to humidity. Because of humidity , there is 0.1 to 0.6 times change in speed of sound. Speed of sound in an ideal gas doesn't depend on pressure and density of medium. The individual contribution of these two factors in determining the speed of sound is countered by each other. The vibration of molecules is accelerated with rise in temperature . Thus, increase in vibrational motion of particles means there would be an increase in speed of sound.

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pressure has no effect on the speed of sound cuz v= (YP/density)1/2 density can be written as mass/ vol and then in numerator it becomes pv which is a constant as pv= nrt hence p has no effetc.

further density of dry air is more than the density of moist air. and as velocity of sound is inversely prop to density so if humidity increases then velcity of sound increases.

and velocity of sound is directly prop to sq. root of temp. bcuz pv=nrt and n=m/M ...subst in eqn we get mrt/Mv and m/v = density so we get p=densty(rt)/m.

  • 6

pressure has no effect on the speed of sound cuz v= (YP/density)1/2 density can be written as mass/ vol and then in numerator it becomes pv which is a constant as pv= nrt hence p has no effetc.

further density of dry air is more than the density of moist air. and as velocity of sound is inversely prop to density so if humidity increases then velcity of sound increases.

and velocity of sound is directly prop to sq. root of temp. bcuz pv=nrt and n=m/M ...subst in eqn we get mrt/Mv and m/v = density so we get p=densty(rt)/m.

  • 6

pressure has no effect on the speed of sound cuz v= (YP/density)1/2 density can be written as mass/ vol and then in numerator it becomes pv which is a constant as pv= nrt hence p has no effetc.

further density of dry air is more than the density of moist air. and as velocity of sound is inversely prop to density so if humidity increases then velcity of sound increases.

and velocity of sound is directly prop to sq. root of temp. bcuz pv=nrt and n=m/M ...subst in eqn we get mrt/Mv and m/v = density so we get p=densty(rt)/m.

  • 5
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