What does it mean by a high value of thermal conductivity (k)?

Question

BlackTom AI · Accepted Answer

Question: What does it mean by a high value of thermal conductivity (k)?

Option a: 'Good conductor' – This is the correct interpretation. A high k means the material readily transfers heat, so it conducts heat efficiently, which is the defining property of a good conductor. The larger the k, the more easily electrons or lattice vibrations can carry thermal energy through the material.

Option b: 'Good insulator' – This is incorrect. Insulators have low thermal conductivity; they resist heat flow. If k were high, the material would not insulate well, so this statement contradicts the meaning of high k.

Option c: 'Could be good or bad conductor, depending on the materials' – This is misleading. Thermal conductivity describes the material's intrinsic ability to conduct heat; a high k universally indicates strong conduction for the material, not a contingent or variable property. In practice, the term 'high k' is used to identify good conductors, while insulators have low k.

Option d: 'Bad conductor' – This is incorrect because a high k implies efficient heat transfer, which is the opposite of a bad conductor. Bad conductors (poor conductors) would have low thermal conductivity.

Summary: Understanding k helps distinguish materials: high k = good conductor, low k = insulator. The remaining options misinterpret the relationship between k and heat transfer capabilities, either reversing the implication or suggesting conditionality that does not align with the definition of thermal conductivity.

What does it mean by a high value of thermal conductivity (k)?单项选择题

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