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  4. A hot and a cold body are kept in vacuum separated from each other. Which of the following causes decrease in temperature of the hot body?

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Q. A hot and a cold body are kept in vacuum separated from each other. Which of the following causes decrease in temperature of the hot body?

Punjab PMETPunjab PMET 2006Thermal Properties of Matter

Solution:

The flow of heat from one body to another, or from one place to another is called transmission of heat. There are three methods of heat transmission.
(a) Radiation: Heat is transmitted in the form of electromagnetic waves from a hot body. It does not require any medium. Hence, in this case heat is transmitted by the process of radiation.
(b) Convection: The process of heat transmission in which the particles of the fluid move is called convection. Convection takes place only in liquids and gases. It requires a medium, hence it is not the correct option.
(c) Conduction: When heat flows from the part at higher temperature to the part at lower temperature, it requires a medium for transmission, then it is known as conduction of heat. Hence, this option is also not correct. Therefore, option (a) is correct.