Answer: constant.
- A constant
- B variable
- C value of zero
- D infinite value
Correct answer: A. constant
Explanation: λ_max·T = 2.9 × 10⁻³ m·K, a constant.
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.