1.

Calculate the speed of sound in air at N.T.P. if thedensity of air at N.T.P. İs 1.29 kg/m? and γ for air is1.4

Answer»

At NTP temp = 293K and pressure is 1 atm, y= 1.4 and density is 1.29kg/m3

also P/density = RT and the value of R = 286.9J/k-kg

speed of sound in air is given by The speed of sound in air at20oC(293.15 K)and absolute pressure1 barcan be calculated as

c= (1.4 (286.9 J/K kg) (293.15 K))1/2

=343.1(m/s)



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