Thermal Equilibrium (Cambridge (CIE) A Level Physics): Flashcards
Exam code: 9702
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Define thermal energy.
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Define thermal energy.
Thermal energy is the energy possessed by an object due to its temperature.
In which direction does thermal energy transfer between two regions in contact?
From the region of higher temperature to the region of lower temperature, until both regions reach the same temperature.
Name the three methods by which thermal energy can be transferred.
Conduction
Convection
Radiation
Thermal energy continues to transfer between two objects in contact until they reach the .......... temperature.
Thermal energy continues to transfer between two objects in contact until they reach the same temperature.
True or False?
When ice is placed in room-temperature water, the ice cools the water by transferring its 'coldness' to it.
False.
Thermal energy always transfers from hotter to cooler regions. The water transfers thermal energy to the ice, which is why the ice warms up and melts.
Define thermal equilibrium.
Two objects or regions are in thermal equilibrium when there is no net transfer of thermal energy between them and they are at an equal temperature.
What happens to the hotter and cooler regions of a system as it approaches thermal equilibrium?
The hotter region cools down and the cooler region heats up until both reach the same temperature.
What determines the final equilibrium temperature reached by two regions in contact?
The initial temperature difference between the two regions.
True or False?
The final equilibrium temperature reached by two objects is always exactly halfway between their initial temperatures.
False.
The final temperature depends on the initial temperature difference between the regions, but it is not necessarily the exact midpoint between them.
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