A) Resistance of the metal.
B) Mobility of atoms in the metal.
C) Minor perturbation in the energy of the metal.
D) Energized electrons moving to the other end.
Correct Answer: D
Solution :On heating one end of the metal piece the other end becomes hot; it is due to the movement of energized electrons from one end to another. It can also be explained on the basis of increased vibrational energy of a molecule that transfers the energy from the subsequent molecules hence the temperature raises due to the increase in collisions. Hence, the correct option is [d].
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