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Mathematics 21 Online
OpenStudy (anonymous):

Waves we cannot actually see (unlike ripples) and those NOT needing a medium to travel within belong to this category of waves?

OpenStudy (jokersmart):

Electromagnetic waves. Electromagnetic waves are waves which can travel through the vacuum of outer space. Mechanical waves, unlike electromagnetic waves, require the presence of a material medium in order to transport their energy from one location to another.

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