Question : In which of the following ways of heat transfer no medium is required?
Option 1: Radiation and Conduction both
Option 2: Conduction
Option 3: Convection
Option 4: Radiation
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Correct Answer: Radiation
Solution : The correct option is Radiation.
Radiation is a method of heat transfer that does not require a medium. In radiation, heat is transferred through electromagnetic waves, such as infrared radiation. Unlike conduction and convection, which require a material medium (solid, liquid, or gas) to transfer heat, radiation can occur in a vacuum or through transparent media. Examples of radiation include the heat from the sun reaching the Earth or the heat emitted by a hot object in a vacuum.
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