3. Radiation: The method of heat transmission in which heat is transferred from a body of high temperature to a body of lower temperature with out affecting the medium is called radiation. Radiation do not need any medium like solid, liquid or gas for transmission.
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True
Explanation:
Radiation is the only way the heat can transfer from anything to anything. The heat energy is transferred without any physical contact between the bodies. The heat transfer merely takes place through a vacuum as the transfer of heat from the sun to the earth. The transfer, in this case, is due to Infrared radiation purely which is a type of electromagnetic radiation. In terms of Albert Einstein's theory, we can quote it as the transfer of energy through energy particles(photons).
Therefore the given statement about radiation is true.
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