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Physics · Oct / Nov 2018 · Paper 11 · Question 17

5054Conduction

A cold solid is placed on top of a hot solid. Thermal energy flows from the hot solid to the cold one. What is the explanation for this?

  1. AA hot solid expands, so its molecules will move further apart.
  2. BEnergy is passed from one molecule to the next.
  3. CHeat always rises.
  4. DMolecules are free to move randomly through the solids.

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Correct answer: B. Energy is passed from one molecule to the next.

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