Heat travels through a metal spoon left in hot soup by this process.

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Your new ahaConduction

Conduction: Transfer of heat through direct contact between materials. Source: Thermal conduction ↗

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20A campfire warms you from a distance through heat carried by electromagnetic waves.RECALL
Thermal Radiation
Thermal radiation carries heat as electromagnetic waves, letting a campfire warm you without direct contact.
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21Light ejects electrons from a material in this effect, whose explanation helped earn Einstein a Nobel Prize.RECALL
Photoelectric Effect
The photoelectric effect releases electrons when light hits a material, and Einstein's explanation of it won a Nobel Prize.
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22This interaction makes a compass needle align with the Earth's magnetic field.RECALL
Magnetism
Magnetism arises from moving electric charge and aligns a compass needle toward magnetic north.
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