Question

energy is transferred in solids by conduction, which means that a heat travels in both directions. b heat travels from the cooler object to the hotter object. c heat travels from the hotter object to the cooler object. d heat does not travel between objects of different temperatures.

Explanation:

Heat transfer by conduction (in solids) follows the principle that heat energy flows from a region of higher temperature (hotter object) to a region of lower temperature (cooler object) to reach thermal equilibrium. Option A is incorrect as heat has a net direction of flow (from hot to cold). Option B is wrong because heat doesn't flow from cooler to hotter (that would violate the second law of thermodynamics for spontaneous heat transfer). Option D is incorrect as heat does transfer between objects of different temperatures (driving force for heat transfer is temperature difference). So the correct understanding matches option C.

Answer:

C. heat travels from the hotter object to the cooler object.