Using Laplace’s formula, what is the speed of sound in air at a pressure of 1.01 × 10⁵ Pa and density 1.29 kg/m³ (γ = 1.4)?
Correct answer B. 331 m/s
Explanation
v = √(γP/ρ) = √(1.4 × 1.01 × 10⁵ / 1.29) ≈ 331 m/s. Leaving out γ gives Newton's value of 280 m/s.
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