11. Define the ratio of the specific heat γ = Cp/Cv, where Cp and Cv are the molar specific heat of an ideal gas at constant pressure and constant volume, respectively. A team of researchers measures the γ value of a new gas. Which of the following γ values is impossible? (A) 1.22 (B) 1.78 (C) 1.65 (D) 1.35

10. The number of collisions a molecule makes per second is called collision frequency. At one atmosphere and 0 °C, estimate the collision frequency of air molecules. [The diameter of an air molecule under one atmosphere and 0 °C is approximately 3×10⁻¹⁰ (m), the average molecular speed is approximately 460 (m/s), and the molecular number density is approximately 2.7×10²⁵ molecules/m³]. (A) 3.5×10⁵ (collisions/s) (B) 3.5×10⁷ (collisions/s) (C) 3.5×10⁹ (collisions/s) (D) 3.5×10¹¹ (collisions/s)

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