Waves that transfer energy through matter are known as All of the waves you have read about so far, even sound waves, are mechanical waves. ... Light is an example of a wave that transfers energy through empty space.
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It is important to remember that all waves transfer energy but they do not transfer matter. For example, if a ball is placed on the surface of a pond when ripples move across it, the ball will move up and down but not outwards with the wave.