Answer: stays constant.
- A stays constant
- B rises steadily
- C falls steadily
- D fluctuates
Correct answer: A. stays constant
Explanation: The absorbed latent heat changes the state, so the temperature stays constant during the change.
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.