Heat Transfer Video with Questions

What are the three methods of heat transfer discussed?

• Compression, Expansion, Stagnation

• Conduction, Convection, Radiation

• Evaporation, Condensation, Precipitation

• Reflection, Refraction, Diffraction

How does heat transfer occur in conduction?

• Through a vacuum

• Through direct contact

• Through the movement of fluids

• Through electromagnetic waves

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What is thermal equilibrium?

• When two objects reach the same temperature

• When heat stops flowing between objects

• When an object emits no thermal energy

• When an object reaches its highest temperature

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What is the thermal conductivity of copper?

• 380

• 0.023

• 0.10

• 0.56

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What causes convection currents in water?

• Water molecules expanding when heated

• Water freezing and becoming denser

• Water absorbing radiation

• Water evaporating into steam

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Why does hot air rise?

• It moves faster than cold air

• It is more dense than cold air

• It contains more moisture

• It is less dense than cold air

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Why is air considered a good insulator?

• It has high thermal conductivity

• It is always in motion

• It absorbs heat efficiently

• It is a poor conductor of heat when still

How does radiation transfer heat?

• Through electromagnetic waves

• Through the movement of fluids

• Through direct contact

• Through conduction

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What happens when an object's temperature increases in terms of radiation?

• It changes color to blue

• It emits less radiation

• It becomes a perfect insulator

• It emits more radiation

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Why do black objects get hotter in the sun compared to white objects?

• They are denser than white objects

• They absorb more radiation

• They emit more radiation

• They reflect more radiation