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For a perfect gas, if we half the density, keeping the temperature same the speed of sound changes. This is due to the change in pressure.

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For a perfect gas, if we half the density, keeping the temperature same the speed of sound changes. This is due to the change in pressure.

(a) True

(b) False

I have been asked this question in semester exam.

Question is taken from The Basic Normal Shock Equations in chapter Normal Shock Waves of Aerodynamics

1 Answer

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Best answer
Right option is (b) False

Explanation: The given statement is false. For a perfect gas, the speed of sound is a pressure of temperature only. And hence, by changing pressure or density but keeping the temperature same, speed of sound will not change.

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