Modern Physics
Modern Physics
2nd Edition
ISBN: 9780805303087
Author: Randy Harris
Publisher: Addison Wesley
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Chapter 3, Problem 1CQ
To determine

To Explain: The way, the two objects at unequal temperatures can be enabled to reach the same temperature.

The way, the electromagnetic radiation enclosed in a cavity has the same temperature as that of cavity walls.

Expert Solution & Answer
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Explanation of Solution

Introduction:

Thermal equilibrium is a state of equilibrium in which the temperature of both the objects becomes the same and there is no further transfer of heat.

In order to make the temperatures of both the objects the same, one has to bring them in contact. Once they are in contact, the heat starts to flow from a higher temperature object to a lower temperature object. The process of heat transfer continues until they reach a state of thermal equilibrium.

The above idea holds true for electromagnetic radiation enclosed in a cavity. The electromagnetic radiation radiates heat which is absorbed by the cavity. This radiation of heat occurs until thermal equilibrium is achieved. At thermal equilibrium, both the radiation inside the cavity and the cavity walls have the same temperature.

Conclusion:

Thus, the temperature of electromagnetic radiation enclosed in a cavity has the same temperature as that of the cavity walls due to thermal equilibrium.

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