Answer: β = 2α.
- A β = α
- B β = 2α
- C β = 3α
- D β = α/2
Correct answer: B. β = 2α
Explanation: For small expansions, area expansion coefficient is approximately twice the linear expansion coefficient: β ≈ 2α.
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.