Amplify Thermal Energy

Geothermal power plants send water through pipes deep underground where it is hot. This causes the temperature of the water to increase.

What happens to the molecules of the water when the temperature of the water increases?

• The energy of the water molecules decreases.

• The energy of the water molecules increases.

• The cold energy of the water molecules decreases.

• More heat molecules combine with the water molecules.

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Aditya is stacking some cups. The diagram above shows the cups before they touch each other. After the cups have been touching for a while, which of the two bottom cups will be cooler, and why?

• The smaller bottom cup will be cooler than the larger bottom cup, because less energy has to transfer for the molecules to reach the same temperature as the molecules of the top cup.

• Both cups will be the same temperature, because both of the top cups had the same amount of energy to transfer and the molecules in the bottom cups start with the same energy.

• The larger bottom cup will be cooler than the smaller bottom cup. It started with more total energy, so less energy had to transfer for both cups in the stack to reach the same total energy.

• The larger bottom cup will be cooler than the smaller bottom cup, because the energy that transferred to it was spread out over more molecules.

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Do You Understand this slide?

• Yes

• NO

• Maybe

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thermal energy

• The total energy of all the particles of an object measured with temperature.

• the energy held by an object because of its position relative to other objects, stresses within itself, its electric charge, or other factors.

• the energy that it possesses due to its motion.

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When two samples come in contact the energy will flow

• from the cold one to the warmer one.

• from the warmer one to the cooler one.

• energy does not move.

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What is the BEST definition of "temperature"?

• the amount of movement that atoms store

• The transfer of energy from one form to another

• A measure of the average speed of the molecules of a substance.

• A measure of how hot or cold something is

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What is the definition of "equilibrium"?

• a balanced state in which a system is stable, such as when two samples are at the same temperature

• when two things exchange molecules

• when two things are balanced and weigh the same

• when two things exchange energy

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What is the primary method by which thermal energy is amplified in a solar thermal power plant?

• Concentrating sunlight using mirrors or lenses

• Using photovoltaic cells to convert sunlight to electricity

• Burning fossil fuels to generate heat

• Utilizing wind turbines to generate electricity

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Which of the following materials is most effective in amplifying thermal energy through insulation?

• Copper

• Glass wool

• Aluminum

• Iron

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In a thermos flask, which mechanism is primarily used to prevent the loss of thermal energy?

• Conduction

• Convection

• Radiation

• All of the above