Which term describes heat transfer through electromagnetic waves that can occur in a vacuum?

Which term describes heat transfer through electromagnetic waves that can occur in a vacuum?

• A. Reflection
• B. Radiation
• C. Conduction
• D. Convection

Answer: (B)

Radiation describes heat transfer through electromagnetic waves, which can travel through empty space. This is why the Sun can warm the Earth even though there’s a vacuum between them—the energy moves as light and infrared waves without needing matter to carry it. Conduction needs direct contact between particles, so it only happens in solids, liquids, or gases. Convection relies on the bulk movement of a fluid, which requires a substance to move. Reflection isn’t a heat-transfer mechanism by itself; it’s the bouncing of waves off a surface, affecting how energy is distributed but not transferring heat through space.

Radiation describes heat transfer through electromagnetic waves, which can travel through empty space. This is why the Sun can warm the Earth even though there’s a vacuum between them—the energy moves as light and infrared waves without needing matter to carry it.

Conduction needs direct contact between particles, so it only happens in solids, liquids, or gases. Convection relies on the bulk movement of a fluid, which requires a substance to move. Reflection isn’t a heat-transfer mechanism by itself; it’s the bouncing of waves off a surface, affecting how energy is distributed but not transferring heat through space.