Video in TIB AV-Portal: Experiments with Water Waves

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Experiments with Water Waves
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CC Attribution - NoDerivatives 3.0 Germany:
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C 14861
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Other Version(s) German
IWF (Göttingen)
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Video-Clip ; F, 6 min 26 sec

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Some of the fundamental properties of waves are demonstrated using surface waves in a water trough.
Keywords acoustics waves water waves interference reflection refraction imaging tunneling
IWF Classification physics vibrational science, acoustics

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with a flat water trough as 1st use 200 years ago by Thomas Young some properties of waves will be
demonstrated a a flat plate touches
the water surface evenly the the water
surface is illuminated from underneath a mirror reflects the image onto the wall of the lecture hall the flat plate is
being moved up and down periodically with an
extensive and creates plane could pillory
waves they're running upwards in the picture these plane waves are reflected all the flat wall which is being positioned in the water a standing wave is generated this wall is rotated the plane wave is reflected sideways note the superposition of the incident and the reflected wave now half of the spaces to be shielded by a wall
through diffraction however the wave also appears in the range of the
geometric shadow using the 2nd war a small slit is produced by diffraction the wave enters most of the space behind the select and had what the the the the a short
wave train is produced by briefly dipping a point source into the water
because of dispersion the short waves travel faster than the long ones
not wave trains are produced with 2 point sources the wave trains are
superpositions the the a point source
dipped periodically into the water a circular wave is the result
the new year
2 point sources are dipped periodically and in phase the an interference pattern is created as
1st observed by young twice
a day the and interference pattern is produced with waves of a larger frequency or shorter wavelength this chapter
the but by inserting a Plexiglas
played into the water a region of shallow water depth is formed In this region the waves travel more slowly than in deeper water when a
plane wave impinges from below on such a region of small away velocity it will be refracted yeah the the plastic disk in the shape of the lands refraction focus is a plane wave
into a focal spot note that the size of this spot is comparable to a
wavelength at the total
internal reflection is demonstrated a wave travels from below in a region of shallow depth and impinges on a region of larger debts the angle of incidence exceeds the critical angle the wave is totally reflected
In the deeper water the wave travels along the interface and is transversely attenuated now the
width of the Deepwater region is reduced and a wave is noticed in
the upper region of shallow water before the width of the former vanishes this important phenomenon is called frustrated total internal reflection