Answer: 5.67 W.
- A 0.567 W
- B 5.67 W
- C 56.7 W
- D 0.057 W
Correct answer: B. 5.67 W
Explanation: P = σAT4 = 5.67×10-8 × 10-4 × 1012 = 5.67 W.
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.