Why do longitudinal waves always need a medium to propagate while the transverse waves do not?
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The wave in which the particles of a medium vibrate about their mean positions, in a direction perpendicular to the direction of propagation of the wave is called a transverse wave. A transverse wave is composed of crest and trough. It can be produced in solids and on the surface of liquids.
In a longitudinal wave the distance between two consecutive compressions or between two consecutive rarefactions is equal to one wavelength while in a transverse wave the distance between two consecutive crests or between two consecutive troughs is equal to one wavelength.
The wave in which the particles of a medium vibrate about their mean positions in the direction of propagation of sound is called the longitudinal wave. Thus sound travels in air in the form of longitudinal waves. Actually the longitudinal waves can be produced in solids, liquids as well as gases.
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The wave in which the particles of a medium vibrate about their mean positions, in a direction perpendicular to the direction of propagation of the wave is called a transverse wave. A transverse wave is composed of crest and trough. It can be produced in solids and on the surface of liquids.
In a longitudinal wave the distance between two consecutive compressions or between two consecutive rarefactions is equal to one wavelength while in a transverse wave the distance between two consecutive crests or between two consecutive troughs is equal to one wavelength.
The wave in which the particles of a medium vibrate about their mean positions in the direction of propagation of sound is called the longitudinal wave. Thus sound travels in air in the form of longitudinal waves. Actually the longitudinal waves can be produced in solids, liquids as well as gases.
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