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Molar mass of the gas = 4g/mol. Speed of sound v = √γRT / m = √γ × 3 × 273 × 4 × 10⁻³

1. γ = 1.6 = 16/10 = 8/5
2. Cp / Cv = 8/5
3. Cp = 8 × 5/5 = 8 J K⁻¹ mol⁻¹
4. [Cv = 5.0 J K⁻¹ given]

Correct answer: Cp / Cv = 8/5

Solution

The ratio of specific heats (Cp/Cv) is denoted by γ, and the problem explicitly states γ = 8/5, which matches option B.

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