Question

For objects at thermal equilibrium, which of the following is true?

(a) Each is at the same temperature.

(b) Each has the same internal energy.

(c) Each has the same heat.

(d) All of the above.

(e) None of the above.

Short answer

(a) Each is at the same temperature.

Step-by-step solution

Understanding the thermal equilibrium of the objects

Heat flows from an object having higher temperature to an object having a lower temperature.When the temperatures of both objects are equal, both of them are said to be in thermal equilibrium.

Explanation for the properties of both objects, which are in thermal equilibrium

There is no heat transfer between the two objects in thermal equilibrium as both objects have an equal temperature.

The internal energy of the object is dependent on the amount of material or matter contained within it. The mass of both objects is not mentioned. Since both masses can vary, both objects have different internal energies.

In thermal equilibrium, the heat is not being transferred from one object to another. So, it is not the property of any object, and it can only be transferred.