Answer: 16 times.
- A 16 times
- B 4 times
- C 2 times
- D 8 times
Correct answer: A. 16 times
Explanation: Since E ∝ T⁴, doubling T multiplies the emission by 2⁴ = 16.
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.