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On heating one end of a piece of a metal, the other end becomes hot because of:

1. resistance of the metal
2. mobility of atoms in the metal
3. energised electrons moving to the other end
4. minor perturbation in the energy of atoms

Correct answer: energised electrons moving to the other end

Solution

The heat transfer in metals occurs primarily due to the movement of free electrons, which carry energy from the hot end to the cooler end.

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