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 |  | Circular wave on the water surface generated by a small ball oscillating in the vertical direction. At distances large as compared to the diameter of the ball it can be considered as a point source of the wave. | ||||
 | | Interference between two circular waves on the water surface. Let us consider two small balls which oscillate on the water surface. Every ball excites the wave which interferes with the wave from the other ball. As a result we can see on the water surface a typical interference pattern. | ||||
 | | Constructive interference of the circular wave with the wave reflected from the wall. A vibrating ball situated near to the totally reflecting wall excites a circular wave. If the distance between the ball and the wall equals the integer number of the half wavelengths, then on the right of the source the waves will interfere in phase increasing the wave crest. | ||||
 | | Destructive interference of the circular wave with the wave reflected from the wall. The distance between the source and the wall equals the odd number of quarter wavelengths. In this case on the right of the source the waves will interfere in anti-phase and we can see a wide valley where the amplitude of oscillation equals zero. | ||||
 | | The diffraction of the circular wave on the narrow slit in the wall. On the right of the wall we can see the appearance of a new circular wave with the smaller amplitude. This corresponds to Huygens-Fresnel principle according to which every element of the wave front generates the secondary circular waves. | ||||
 | | The interference of two linear waves propagating in the opposite directions gives a standing wave. We can see that small red ball, which is in the loop of standing wave, oscillates with the maximal amplitude, while the parallelepiped, which is situated in the node of the standing wave, does not oscillate (it is just rotating). | ||||
Eli Priyatna 16 Jun, 2011--
Source: http://basistik.blogspot.com/2011/06/interference-of-waves-on-water-surface.html
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