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en.wikipedia.org/wiki/Longitudinal_wave

Longitudinal waves are waves in which the displacement of the medium is in the same direction as, or the opposite direction to, the direction of propagation of the wave. Mechanical longitudinal waves are also called compressional or compression waves, because they ... rarefaction when traveling through a medium, and pressure waves, because ...

www.answers.com/Q/A_wave_travels_through_a_medium_because

A mechanical wave travels through a medium because a medium is necessary ... We know that a mechanical wave requires a medium through which to travel.

www.physicsclassroom.com/class/waves/Lesson-1/What-is-a-Wave

A wave can be described as a disturbance that travels through a medium from .... The gull or duck is not transported to the shore because the water on which it ...

www.physicsclassroom.com/class/sound/Lesson-1/Sound-as-a-Longitudinal-Wave

For a sound wave traveling through air, the vibrations of the particles are best ... Sound waves in air (and any fluid medium) are longitudinal waves because ...

www.proprofs.com/quiz-school/story.php?title=intro-to-waves-quiz

As a wave moves through a medium, the individual particles of the medium move ... Mechanical waves propagate or move through a medium because ______.

science.nasa.gov/ems/02_anatomy

These mechanical waves travel through a medium by causing the molecules to ... waves cannot travel in the vacuum of space because there is no medium to ...

www.edu.pe.ca/gray/class_pages/krcutcliffe/physics521/14waves/waves%20notes.htm

Sound is a mechanical wave, but you cannot see sound waves. They are mechanical because they need a medium to travel through. In most cases, sound  ...

www.acs.psu.edu/drussell/Demos/Dispersion/dispersion.html

Dispersion causes the shape of a wave pulse to change as it travels ... medium is called a non-dispersive medium and waves traveling through this medium will ...

www.uni-miskolc.hu/~www_fiz/palasthy/Selected_topics/WavesInElasticMediaSuperposition.pdf

If a vibratory disturbance occurs at any point in an elastic medium, this disturbance will be transmitted from one layer to the next through the medium, because of the ... same direction as the wave propagation through that point. ... such a wave travels along the string without changing its form, if the internal frictional losses.