Answer: 2:1.
- A 1:1
- B 2:1
- C 3:2
- D 1:2
Correct answer: B. 2:1
Explanation: Cv(monatomic) = (3/2)R, Cv(polyatomic, f=6) = (6/2)R = 3R. Ratio = 3R/(3R/2) = 2, so the ratio is 2:1.
During a phase change (melting or boiling), temperature stays constant while heat is absorbed entirely as latent heat (Q=mL); temperature only rises again once the substance is fully in its new phase.
Concept context
Temperature scales, thermal expansion, calorimetry, and the three modes of heat transfer including radiation laws.