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Home > Exam Questions > ATPL - Airline Transport Pilot Licence > Principles of Flight > For dry air of fixed composition in the ideal-gas approximation, which statement about the speed of sound is correct?

319 - ATPL Question Bank in English - For dry air of fixed composition in the ideal-gas approximation, which statement about the speed of sound is correct?

Question 319 - Principles of Flight - ATPL - Airline Transport Pilot Licence

Varies with the square root of the absolute temperature.

Doubles if the temperature increases from 9° to 36° Centigrade.

It must be constant at all altitudes, even when air temperature changes.

Increases always if the density of the air decreases.

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