The reason for introducing Laplace correction in the expression for the velocity of sound in a g...

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The reason for introducing Laplace correction in the expression for the velocity of sound in a gaseous medium is
(a) no change in the temperature of the medium during the propagation of the sound through it
(b) no change in the heat of the medium during the propagation of the sound through it
(c) change in the pressure of the gas due to the compression and rarefaction
(d) change in the volume of the gas
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