Which of the following modes of heat transfer does not require any medium for transfer of heat?

Convection

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Radiation

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Conduction

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Conduction and convection

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Solution

The correct option is B
Radiation

Radiation is a process in which transfer of heat takes place in form of electromagnetic waves. Hence, radiation does not require any medium for the transfer of heat.
For example, heat from the Sun is transferred to Earth by radiation.

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