Answer: 1 mm.
- A 0.1 mm
- B 1 mm
- C 0.5 mm
- D 0.01 mm
Correct answer: B. 1 mm
Explanation: ΔL = αLΔT = 2×10⁻⁵ × 1 × 50 = 1×10⁻³ m = 1 mm.
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.