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Extensible Markup Language  |  1995-08-15  |  2KB  |  34 lines
  1. <?xml version="1.0" encoding="utf-8" ?>
  2. <!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
  3. <card>
  4.     <id>21379</id>
  5.     <filler1>0</filler1>
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  9.     <owner>5472</owner>
  10.     <link rel="stylesheet" type="text/css" href="stylesheet_3106.css" />
  11.     <content>
  12.         <layer>background</layer>
  13.         <id>25</id>
  14.         <text><span class="style10">ave Theory (4 of 11)</span><span class="style7">The </span><span class="style26">frequency</span><span class="style7"> (</span><span class="style26">f</span><span class="style7">) of the wave motion is defined as the number of complete oscillations or cycles per second. The unit of frequency is the </span><span class="style26">hertz</span><span class="style7"> (Hz), named after the German physicist Heinrich Rudolf Hertz: 1 hertz = 1 cycle per second. The </span><span class="style26">amplitude</span><span class="style7"> is the maximum displacement from the equilibrium position. The </span><span class="style26">wavelength</span><span class="style7"> () is the distance between two successive peaks (or troughs) in the wave. The </span><span class="style26">speed of propagation</span><span class="style7"> (</span><span class="style26">v</span><span class="style7">) of the compressions, or </span><span class="style26">phase speed </span><span class="style7">of the wave, is equal to the product of the frequency and the wavelength:</span><span class="style26">v</span><span class="style7"> = </span><span class="style26">f </span><span class="style7">().</span><span class="style10"></span></text>
  15.     </content>
  16.     <content>
  17.         <layer>background</layer>
  18.         <id>26</id>
  19.         <text><span class="style10">.  Frequency.</span><span class="style7">  Frequency = cycles per second.  1 cycle per second = 1 hertz (Hz).</span><span class="style10">6.  Wavelength.</span><span class="style7">  Wavelength is the distance between two successive points along a wave with similar amplitudes.</span></text>
  20.     </content>
  21.     <content>
  22.         <layer>background</layer>
  23.         <id>23</id>
  24.         <text>ΓÇó QUANTUM THEORY AND RELATIVITYΓÇó ACOUSTICSΓÇó OPTICSΓÇó ELECTROMAGNETISMΓÇó COASTSΓÇó THE OCEANSΓÇó MEDICAL TECHNOLOGYΓÇó RADIO, TELEVISION AND VIDEOΓÇó SEEING THE INVISIBLE</text>
  25.     </content>
  26.     <content>
  27.         <layer>background</layer>
  28.         <id>36</id>
  29.         <text>2630323496100242326332</text>
  30.     </content>
  31.     <name>p028-4</name>
  32.     <script></script>
  33. </card>
  34.