The reason for introducing Laplace correction in the expression for the velocity of sound in a gaseous medium is
no change in the temperature of the medium during the propagation of the sound through it
no change in the heat of the medium during the propagation of the sound through it
change in the pressure of the gas due to the compression and rarefaction
change in the volume of the gas
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According to Laplace when sound propagate in a gaseous medium the compressions and rarefactions are formed periodically at a very high speed. Some heat is produced at the places of compressions and some heat is lost at the places of rarefactions, but there is no transfer of heat between the compressions and rarefactions in the gaseous medium.
What is the effect of humidity on sound waves when humidity increases?
Speed of sound waves is more
Speed of sound waves is less
Speed of sound waves remains same
Speed of sound waves becomes zero
Velocity of sound
When water vapour are present in air, average molecular weight of air decreases and hence velocity increases.
Ultrasonic, infrasonic and audible waves travel through a medium with speeds respectively, then
are nearly equal
and
Speed of wave is given by
Frequency of wave
Therefore, the frequency of wave varies directly with speed of wave.
Frequencies,
Therefore speeds of waves
The bulk modulus of a liquid of density is . The speed of sound in that liquid is (in m)
200
250
100
500
The speed of sound in liquid,
The velocity of sound in a container of air at is . It temp. of container were raised to , what would be the velocity of sound?
Velocity of sound waves in air is . For a particular sound wave in air, a path difference of is equivalent to phase difference of . The frequency of this wave is
From
The velocity of sound in hydrogen is . Its velocity in a mixture of hydrogen and oxygen containing 4 parts by volume of hydrogen and 1 part oxygen is
If , then
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