There are two basic kinds of waves: electromagnetic and mechanical.
Mechanical waves include water waves, sound waves, and waves on ropes or springs. Mechanical waves travel in a medium (such as air, water, glass, or rock).
Electromagnetic waves can travel in a medium or in a vacuum.
•Mechanical waves include water waves, sound waves, and waves on ropes or springs. Mechanical waves travel in a medium (such as air, water, glass, or rock).
•Electromagnetic waves can travel in a medium or in a vacuum.
