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

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Radiation

Convection

Conduction

Temperature remains unchanged

answer is A.

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Detailed Solution

Concept: There are three ways that heat may move: conduction, convection, and radiation. Heat is transferred by conduction when two materials are in close proximity to one another.
Heat will be transferred more quickly the better the conductor. Convection is the transfer of thermal energy from hot places to cool spots. Hotter portions of a fluid or gas rise to cooler regions of the fluid or gas, a process known as convection. Similar to conduction and convection, radiation is a method of heat transmission that doesn't need direct contact between the heat source and the object being heated. Conduction and convection are not feasible since the two substances are maintained in a vacuum and apart from one another. As a result, heat has transferred from one body to another in the form of radiation.
Hence, the correct option is 1.

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