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O Levels Physics (5054)•5054/11/O/N/21
Question 13 from 5054/11/O/N/21

Explanation

Specific heat capacity explains energy for temperature change

Steps:

  • Thermal energy for temperature rise is Q = mcΔT, where m is mass, c is specific heat capacity, and ΔT is temperature change.
  • For same m (1.0 kg) and ΔT (1°C), Q depends directly on c.
  • Lower c means less Q needed.
  • Copper's c (385 J/kg°C) is lower than water's (4186 J/kg°C), so less energy for copper.

Why B is correct:

  • Specific heat capacity is energy per unit mass per degree change; lower value for copper means less energy required, per Q = mcΔT.

Why the others are wrong:

  • A: Melting point relates to phase change, not temperature rise in solid state.
  • C: Specific latent heat is for phase changes, irrelevant to temperature increase without melting.
  • D: Conductivity affects heat transfer speed, not total energy to raise temperature.

Final answer: B

Topic: Specific heat capacity

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