Which mode of heat transfer requires no medium?

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Conduction and radiation

Radiation

Conduction

Convection

answer is A.

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Detailed Solution

The process of the transfer of heat from one place to another place without heating the intervening medium is called radiation.

Radiation takes place through electromagnetic waves and requires no medium for transfer. It can take place through a vacuum as well.

For example, the heat from the sun reaches the earth.

Conduction and convection require the movement of material from one place to another or the collisions of molecules within the material.

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