Answer: T⁴.
- A T
- B T²
- C T³
- D T⁴
Correct answer: D. T⁴
Explanation: Stefan-Boltzmanns law states E = σT⁴, so radiated power per unit area is proportional to the fourth power of absolute temperature.
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.