Vibration can be along motion direction {longitudinal wave}|. Sound waves are longitudinal waves.
Mechanical-wave vibrations can be across motion direction {transverse wave}|. Guitar or violin strings vibrate transversely. Molecular interactions are at right angles to direction that wave travels, which is down string and back. Longer strings make lower frequency. Tighter strings make higher frequency. Larger diameter strings decrease frequency. Electromagnetic waves have oscillating transverse electric and magnetic fields.
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Date Modified: 2022.0225