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What is the speed of sound in air at an altitude where temperature is 299K?(a) 346.61K(b) 343.61K(c) 71.61 °C(d) 70.61 °CI have been asked this question in semester exam.Enquiry is from Measurement of Airspeed in division Atmosphere and Air Data Measurement of Aircraft Performance

Answer»

The CORRECT choice is (a) 346.61K

Explanation: The answer is 346.61K. Given T=299K. We know that R=287J/kg-K, γ for air is 1.4.

From a=\(\SQRT{\gamma RT}\)

a=\(\sqrt{1.4*287*299}\)

a=346.61K.



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