<script>on mouseUpput the short name of this card into xTempput char 2 to 6 of xTemp & ".mov" into Movie--put Movieif Movie is not empty then-- put "Animations:" & Movie into pMoviePlayMovieLooped Movie,"Animations:"end ifend mouseUp</script>
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<text><span class="style10">ave Theory (1 of 11)</span><span class="style7">Water waves are a phenomenon that can be seen, and the effects of sound waves are sensed directly by the ear. Some of the waves in the electromagnetic spectrum can also be sensed by the body: light waves by the eye, and the heating effect of infrared by the skin. There are other electromagnetic waves, however, that cannot be experienced directly through any of the human senses, and even infrared can generally only be observed using specialized detectors.Wave phenomena are found in all areas of physics, and similar mathematical equations may be used in each application. Some of the general principles of wave motions are explored here. </span><span class="style10">Wave types and characteristics</span><span class="style7">A </span><span class="style26">traveling wave</span><span class="style7"> is a disturbance that moves or </span><span class="style26">propagates</span><span class="style7"> from one point to another. </span><span class="style26">Mechanical waves</span><span class="style7"> are traveling waves that propagate through a material - as, for example, happens when a metal rod is tapped at one end with a hammer. An initial disturbance at a particular place in a material will cause a force to be exerted on adjacent parts of the material. An </span><span class="style26">elastic force</span><span class="style7"> then acts to restore the material to its equilibrium position. In so doing, it compresses the adjacent particles and so the disturbance moves outward from the source. In attempting to return to their original positions, the particles overshoot, so that at a particular point a </span><span class="style26">rarefaction</span><span class="style7"> (or stretching) follows a </span><span class="style26">compression</span><span class="style7"> (or squeezing). The passage of the wave is observed as variations in the pressure about the equilibrium position or by the speed of oscillations. This change is described as </span><span class="style26">oscillatory</span><span class="style7"> (like a pendulum) or </span><span class="style26">periodic</span><span class="style7">.</span></text>
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<text><span class="style10">. A longitudinal wave</span><span class="style7"> in a 'slinky' spring.</span></text>
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<text>ΓÇó QUANTUM THEORY AND RELATIVITYΓÇó ACOUSTICSΓÇó OPTICSΓÇó ELECTROMAGNETISMΓÇó COASTSΓÇó THE OCEANSΓÇó MEDICAL TECHNOLOGYΓÇó RADIO, TELEVISION AND VIDEOΓÇó SEEING THE INVISIBLE</text>