The sun heating the sand at the beach is an example of radiation, which is the transfer of energy through electromagnetic waves. Unlike conduction or convection, radiation does not require a medium for heat transfer. This process explains why the sand becomes warm under direct sunlight. ;
The sun heating the sand at the beach is an example of radiation, which is the transfer of energy through electromagnetic waves. This process does not require a medium and occurs when sunlight is absorbed by the sand, warming it directly. Thus, option A, radiation, is the correct choice.
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