Key Stage 3 (KS3) Physics Practice Test

The transfer of energy through electromagnetic waves is called radiation. This process involves the emission of energy in the form of electromagnetic waves, which can travel through a vacuum as well as through various media. For example, sunlight reaches the Earth through radiation, which allows us to receive heat and light without the need for a medium like air or water.

In contrast, conduction and convection involve different mechanisms of energy transfer. Conduction occurs through direct contact between materials, where energy is transferred from the hotter part to the cooler part through particle interaction. Convection involves the movement of fluids (liquids or gases), where warmer regions of the fluid rise while cooler parts sink, leading to energy transfer through the flow of the fluid. Subduction, on the other hand, is a geological process relating to tectonic plates and does not pertain to energy transfer in the context of physics. Therefore, radiation is the appropriate term describing the transfer of energy via electromagnetic waves.