Answer: 16E 1.
- A 2E<sub>1</sub>
- B 4E<sub>1</sub>
- C 8E<sub>1</sub>
- D 16E<sub>1</sub>
Correct answer: D. 16E<sub>1</sub>
Explanation: By Stefan-Boltzmanns law, E ∝ T⁴. Doubling T increases E by a factor of 2⁴ = 16, so E<sub>2</sub> = 16E<sub>1</sub>.
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.