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Thermal energy is transported through the molecules due to _______and _______

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in Food Processing Unit Operations by (110k points)
Thermal energy is transported through the molecules due to _______and _______

(a) lattice waves, free electrons

(b) lattice waves, free protons

(c) free protons, free electrons

(d) lattice waves, longitudinal waves

The question was asked by my school principal while I was bunking the class.

This interesting question is from Heat Transfer Applications in section Heat Transfer Applications of Food Processing Unit Operations

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The correct answer is (a) lattice waves, free electrons

Easy explanation: Thermal energy is transported through the molecules due to lattice waves and free electrons. In pure metals, the conduction of heat is based on the flow of free electrons and the effect of lattice waves is considered as negligible. In alloys and nonmetallic solids, since they are only few free electrons, conduction of heat is due to lattice vibrations in between the molecules.

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