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Difficulty: EasyHeat Transfer: Radiation

Unlike conduction and convection, thermal radiation can transfer heat energy through a complete vacuum.

Answer: Answer

Answer

True
The statement is accurate. Thermal radiation is the emission of electromagnetic waves from all matter that has a temperature greater than absolute zero. Because electromagnetic waves do not require a physical medium to propagate, radiation is the only form of heat transfer that can occur in a complete vacuum.

Step-by-Step Solution

1
Identify the physical requirements for conduction and convection.
Both conduction and convection require matter (a physical medium) to transfer heat energy.
Conduction relies on direct contact between vibrating particles, and convection relies on the physical motion of fluids.
2
Determine the physical mechanism for thermal radiation.
Thermal radiation transfers heat via electromagnetic waves.
Electromagnetic waves can travel through empty space because they do not rely on particle interaction.
3
Evaluate the statement based on the identified mechanisms.
The statement is correct; radiation is uniquely capable of transferring heat through a vacuum.
This is the fundamental reason why the Earth is able to receive heat energy from the Sun across the vacuum of outer space.

Key Concept

Radiation propagates without a medium
Estimated Time:30s
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Topics

Heat Transfer: Radiation

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