„Longitudinális állóhullámok csavarrugón” változatai közötti eltérés

A Fizipedia wikiből
 
9. sor: 9. sor:
 
== Longitudinal Standing Waves ==
 
== Longitudinal Standing Waves ==
  
We fix both ends of a coil spring, thereby acheiving an elastic medium. We hit the spring strongly near one end. Let us observe how the disturbance moves through the spring towards the other end, then how it bounces back. With the help of the coil spring we can observe the properties of a wave moving in an elastic medium. By knowing the length of the spring, we can also calculate the speed of propogation, and we can know the phase by observing how the wave bounces. Last but not least, we can tell the propogation of energy in the wave. After all, when we hit the spring on one end, the toy placed at the other end is knocked over after a brief period of time.
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We fix one end of a coil spring which is long in comparison to its diameter. We attach the other end to a vibration generator, which causes oscillations along the logitudinal axis. The thusly acheived longitudinal waves, when they have the right frequency form standing waves. If we examine the spring, in some places we will see its spirals clearly, in other places they will appear blurred. We see them clearly int he nodes, as these areas have little or no amplitude. We see them blurred at the antinodes, since there the oscillation has a large amplitude. At different frequencies, the distances between nodes will be different.
  
  
 
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A lap jelenlegi, 2014. március 9., 13:36-kori változata


Long allohullamok csavarrugon.ogv

Az elhangzó szöveg

Egy a keresztirányú méreteihez képest hosszú csavarrugó egyik végét rögzítsük mereven. A másik végét egy rezgéskeltőhöz rögzítsük, amely a rugó hossztengelyében végez rezgéseket. Az így keltett longitudinális hullámok meghatározott frekvenciákon állóhullámokat eredményeznek. A rugó hosszában vizsgálódva a rugó meneteit hol élesnek, hol pedig elmosódottnak látjuk. Élesnek látjuk a csomópontokat, mert azok rezgésének amplitúdója kicsi illetve nulla. Elmosódottnak látjuk a duzzadó helyeket, mert itt a rugó mozgása nagy amplitúdójú. Különböző frekvenciákon a csomópontok távolsága különböző.

Longitudinal Standing Waves

We fix one end of a coil spring which is long in comparison to its diameter. We attach the other end to a vibration generator, which causes oscillations along the logitudinal axis. The thusly acheived longitudinal waves, when they have the right frequency form standing waves. If we examine the spring, in some places we will see its spirals clearly, in other places they will appear blurred. We see them clearly int he nodes, as these areas have little or no amplitude. We see them blurred at the antinodes, since there the oscillation has a large amplitude. At different frequencies, the distances between nodes will be different.