Answer: Half as long.
- A Twice as long
- B Half as long
- C Same
- D Four times as long
Correct answer: B. Half as long
Explanation: Wiens law: λ_m ∝ 1/T. Doubling temperature halves the peak wavelength, so the star peak wavelength is half that of the Sun.
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.