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------------------------------------------------ Which among the following is true about conduction, convection, and radiation modes of heat transfer?

A. A medium is required for conduction but not required for convection and radiation.
B. A medium is required for conduction, convection, and radiation.
C. A medium is required for conduction and convection but not required for radiation.
D. A medium is not required for conduction and radiation.

A medium is required for conduction and convection but not for radiation(c). This is because conduction and convection rely on interactions between molecules, which act as the medium for heat transfer. Radiation, however, transmits heat as electromagnetic waves, which do not require any medium.

Explanation:

The correct statement regarding the modes of heat transfer such as conduction, convection, and radiation is:

c. A medium is required for conduction and convection but not required for radiation.

This statement is true because heat transfer via conduction and convection relies on the interaction between molecules. Take for instance in a liquid or solid, these molecules provide the medium for the heat to be conducted or convected. Radiation, on the other hand, is the only mode of heat transfer that can occur in a vacuum or the absence of a medium because it is propagated in the form of electromagnetic waves that do not require a physical medium to travel.

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