longitudinal and transverse waves

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longitudinal waves

Longitudinal waves have rarefactions which is when the particles are spread out.

Compressions are when the particles have been squashed together

When sound travels, it travels in a longitudinal wave

transverse waves

the amplitude and wavelength on a transverse wave is perpendicular (meet at a right angle) all the time.

when light travels, it travels in a transverse wave

the crest is the highest point of a wave.

the tough is the lowest point of a wave.