The mode of heat transfer responsible for heating a body without a physical medium is:

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Multiple Choice

The mode of heat transfer responsible for heating a body without a physical medium is:

Explanation:
Heat transfer by electromagnetic waves does not require a medium. This is radiation. The Sun warming the Earth is a classic example: energy travels through the vacuum of space and heats the planet without any physical substance in between. Conduction needs direct contact with a material to move energy through molecular interactions, and convection requires a moving fluid to carry heat. Refrigeration isn’t a mode of heat transfer; it’s a process to remove heat. So the mode responsible for heating a body without a physical medium is radiation.

Heat transfer by electromagnetic waves does not require a medium. This is radiation. The Sun warming the Earth is a classic example: energy travels through the vacuum of space and heats the planet without any physical substance in between. Conduction needs direct contact with a material to move energy through molecular interactions, and convection requires a moving fluid to carry heat. Refrigeration isn’t a mode of heat transfer; it’s a process to remove heat. So the mode responsible for heating a body without a physical medium is radiation.

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