File Name: difference between longitudinal and transverse waves .zip
In physics , sound is a vibration that propagates as an acoustic wave , through a transmission medium such as a gas, liquid or solid. In human physiology and psychology , sound is the reception of such waves and their perception by the brain.
In physics , a transverse wave is a wave that vibrates perpendicular to the direction of the wave or path of propagation. A simple example is given by the waves that can be created on a horizontal length of string by anchoring one end and moving the other end up and down. Another example is the waves that are created on the membrane of a drum. The waves propagate in directions that are parallel to the membrane plane, but the membrane itself gets displaced up and down, perpendicular to that plane. Light is another example of a transverse wave, where the oscillations are the electric and magnetic fields , which point at right angles to the ideal light rays that describe the direction of propagation.
Waves come in many shapes and forms. While all waves share some basic characteristic properties and behaviors, some waves can be distinguished from others based on some observable and some non-observable characteristics.
It is common to categorize waves based on these distinguishing characteristics. Longitudinal versus Transverse Waves versus Surface Waves. One way to categorize waves is on the basis of the direction of movement of the individual particles of the medium relative to the direction that the waves travel.
Categorizing waves on this basis leads to three notable categories: transverse waves, longitudinal waves, and surface waves. A transverse wave is a wave in which particles of the medium move in a direction perpendicular to the direction that the wave moves.
Suppose that a slinky is stretched out in a horizontal direction across the classroom and that a pulse is introduced into the slinky on the left end by vibrating the first coil up and down. Energy will begin to be transported through the slinky from left to right. As the energy is transported from left to right, the individual coils of the medium will be displaced upwards and downwards.
In this case, the particles of the medium move perpendicular to the direction that the pulse moves. This type of wave is a transverse wave. Transverse waves are always characterized by particle motion being perpendicular to wave motion. A longitudinal wave is a wave in which particles of the medium move in a direction parallel to the direction that the wave moves.
Suppose that a slinky is stretched out in a horizontal direction across the classroom and that a pulse is introduced into the slinky on the left end by vibrating the first coil left and right.
As the energy is transported from left to right, the individual coils of the medium will be displaced leftwards and rightwards. In this case, the particles of the medium move parallel to the direction that the pulse moves. This type of wave is a longitudinal wave. Longitudinal waves are always characterized by particle motion being parallel to wave motion.
A sound wave traveling through air is a classic example of a longitudinal wave. As a sound wave moves from the lips of a speaker to the ear of a listener, particles of air vibrate back and forth in the same direction and the opposite direction of energy transport. Each individual particle pushes on its neighboring particle so as to push it forward. The collision of particle 1 with its neighbor serves to restore particle 1 to its original position and displace particle 2 in a forward direction.
This back and forth motion of particles in the direction of energy transport creates regions within the medium where the particles are pressed together and other regions where the particles are spread apart.
Longitudinal waves can always be quickly identified by the presence of such regions. This process continues along the chain of particles until the sound wave reaches the ear of the listener. A detailed discussion of sound is presented in another unit of The Physics Classroom Tutorial.
Waves traveling through a solid medium can be either transverse waves or longitudinal waves. Yet waves traveling through the bulk of a fluid such as a liquid or a gas are always longitudinal waves. Transverse waves require a relatively rigid medium in order to transmit their energy. As one particle begins to move it must be able to exert a pull on its nearest neighbor. If the medium is not rigid as is the case with fluids, the particles will slide past each other.
This sliding action that is characteristic of liquids and gases prevents one particle from displacing its neighbor in a direction perpendicular to the energy transport. It is for this reason that only longitudinal waves are observed moving through the bulk of liquids such as our oceans. Earthquakes are capable of producing both transverse and longitudinal waves that travel through the solid structures of the Earth.
When seismologists began to study earthquake waves they noticed that only longitudinal waves were capable of traveling through the core of the Earth. For this reason, geologists believe that the Earth's core consists of a liquid - most likely molten iron. While waves that travel within the depths of the ocean are longitudinal waves, the waves that travel along the surface of the oceans are referred to as surface waves. A surface wave is a wave in which particles of the medium undergo a circular motion.
Surface waves are neither longitudinal nor transverse. In longitudinal and transverse waves, all the particles in the entire bulk of the medium move in a parallel and a perpendicular direction respectively relative to the direction of energy transport. In a surface wave, it is only the particles at the surface of the medium that undergo the circular motion.
The motion of particles tends to decrease as one proceeds further from the surface. Any wave moving through a medium has a source. Somewhere along the medium, there was an initial displacement of one of the particles. For a slinky wave, it is usually the first coil that becomes displaced by the hand of a person. For a sound wave, it is usually the vibration of the vocal chords or a guitar string that sets the first particle of air in vibrational motion.
At the location where the wave is introduced into the medium, the particles that are displaced from their equilibrium position always moves in the same direction as the source of the vibration. So if you wish to create a transverse wave in a slinky, then the first coil of the slinky must be displaced in a direction perpendicular to the entire slinky. Similarly, if you wish to create a longitudinal wave in a slinky, then the first coil of the slinky must be displaced in a direction parallel to the entire slinky.
Electromagnetic versus Mechanical Waves. Another way to categorize waves is on the basis of their ability or inability to transmit energy through a vacuum i. Categorizing waves on this basis leads to two notable categories: electromagnetic waves and mechanical waves. An electromagnetic wave is a wave that is capable of transmitting its energy through a vacuum i. Electromagnetic waves are produced by the vibration of charged particles.
Electromagnetic waves that are produced on the sun subsequently travel to Earth through the vacuum of outer space. Were it not for the ability of electromagnetic waves to travel to through a vacuum, there would undoubtedly be no life on Earth.
All light waves are examples of electromagnetic waves. Light waves are the topic of another unit at The Physics Classroom Tutorial. While the basic properties and behaviors of light will be discussed, the detailed nature of an electromagnetic wave is quite complicated and beyond the scope of The Physics Classroom Tutorial.
A mechanical wave is a wave that is not capable of transmitting its energy through a vacuum. Mechanical waves require a medium in order to transport their energy from one location to another. A sound wave is an example of a mechanical wave. Sound waves are incapable of traveling through a vacuum. Slinky waves, water waves, stadium waves, and jump rope waves are other examples of mechanical waves; each requires some medium in order to exist.
A slinky wave requires the coils of the slinky; a water wave requires water; a stadium wave requires fans in a stadium; and a jump rope wave requires a jump rope. The above categories represent just a few of the ways in which physicists categorize waves in order to compare and contrast their behaviors and characteristic properties.
This listing of categories is not exhaustive; there are other categories as well. The five categories of waves listed here will be used periodically throughout this unit on waves as well as the units on sound and light.
A transverse wave is transporting energy from east to west. The particles would be moving back and forth in a direction perpendicular to energy transport. The waves are moving westward, so the particles move northward and southward. A wave is transporting energy from left to right. The particles of the medium are moving back and forth in a leftward and rightward direction. The particles are moving parallel to the direction that the wave is moving.
This must be a longitudinal wave. The fans will need to sway side to side. Thus, as the wave travels around the stadium they would be moving parallel to its direction of motion. If they rise up and sit down, then they would be creating a transverse wave. Mechanical waves require a medium in order to transport energy. Sound, like any mechanical wave, cannot travel through a vacuum. A science fiction film depicts inhabitants of one spaceship in outer space hearing the sound of a nearby spaceship as it zooms past at high speeds.
Critique the physics of this film. This is an example of faulty physics in film. Sound is a mechanical wave and could never be transmitted through the vacuum of outer space. If you strike a horizontal rod vertically from above, what can be said about the waves created in the rod?
The particles vibrate in the direction of the source which creates the initial disturbance. Since the hammer was moving vertically, the particles will also vibrate vertically. They travel in a direction that is at right angles to the direction of the particles of the medium.
The characteristic described in statement c is a property of all transverse waves, but not necessarily of all mechanical waves. A mechanical wave can also be longitudinal. The sonar device on a fishing boat uses underwater sound to locate fish. Would you expect sonar to be a longitudinal or a transverse wave? Only longitudinal waves are capable of traveling through fluids such as water.
When a transverse wave tries to propagate through water, the particles of the medium slip past each other and so prevent the movement of the wave. Physics Tutorial. What Can Teachers Do My Cart Subscription Selection.
The content of this page was originally posted on August 26, Animations were last updated on August 5, Mechanical Waves are waves which propagate through a material medium solid, liquid, or gas at a wave speed which depends on the elastic and inertial properties of that medium. There are two basic types of wave motion for mechanical waves: longitudinal waves and transverse waves. The animations below demonstrate both types of wave and illustrate the difference between the motion of the wave and the motion of the particles in the medium through which the wave is travelling. In a longitudinal wave the particle displacement is parallel to the direction of wave propagation.
the medium or the channel moves.
In a longitudinal wave, the propagation of energy is in the direction of the motion, while in a transverse wave the propagation of energy is perpendicular to the direction of motion. A longitudinal wave is a wave that moves in the direction that it was started. It has a compression increased intensity of the medium particles and a rarefaction a reduction of intensity. A slinky lying horizontal and pushed horizontally is a simple way to demonstrate a longitudinal wave. A transverse wave is wave that travels perpendicular or at right angles to the direction it was started.
There are two types of waves, transverse and longitudinal waves. By observing the device attached to the Exhibition room ceiling that generates transverse and longitudinal meters-long waves, we can understand the difference in properties between the two types of waves. Waves can be divided into two types according to how they transmit.
Его слова не сразу дошли до ее сознания. Стратмор убил Чатрукьяна. Хейл, видимо, не догадывается, что она видела его внизу. - Стратмор знает, что я это видел! - Хейл сплюнул. - Он и меня убьет. Если бы Сьюзан не была парализована страхом, она бы расхохоталась ему в лицо. Она раскусила эту тактику разделяй и властвуй, тактику отставного морского пехотинца.
- Я сегодня улетаю.
Спросил он, обращаясь в пустоту и чувствуя, как покрывается. Наверное, придется потревожить этой новостью Стратмора. Проверка на наличие вируса, - решительно сказал он себе, стараясь успокоиться. - Я должен сделать проверку на наличие вируса. Чатрукьян знал: это первое, чего в любом случае потребует Стратмор.
Клушар приложил руку ко лбу.
Хейл наклонил голову набок, явно заинтригованный такой скрытностью. И, как бы желая обратить все в игру, сделал еще один шаг. Но он не был готов к тому, что произошло в следующее мгновение. Сохраняя ледяное спокойствие, Сьюзан ткнула указательным пальцем в твердокаменную грудь Хейла и заставила его остановиться.
Но когда он начал подниматься на следующую ступеньку, не выпуская Сьюзан из рук, произошло нечто неожиданное. За спиной у него послышался какой-то звук.
Wave , propagation of disturbances from place to place in a regular and organized way.