allerySpeed of sound in ideal gas:
AcV
Bsqrt(RT/M)
Cv_sound = sqrt(γRT/M)
Dsqrt(kT)
Answer & Solution
Correct answer: C. v_sound = sqrt(γRT/M)
v_sound = sqrt(γP/ρ) = sqrt(γRT/M).
For air (γ=1.4, M=29 g/mol) at 300 K: ≈ 346 m/s.
Speed of sound ≈ 70% of v_rms.
Sound is a pressure wave whose propagation speed depends on γ.
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