Answer: Wien's displacement law.
- A Wien's displacement law
- B Ohm's circuit law
- C Boyle's gas law
- D Hooke's elastic law
Correct answer: A. Wien's displacement law
Explanation: Wien’s displacement law: λ_max ∝ 1/T.
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.