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1.1
date	2017.10.30.12.06.58;	author root;	state Exp;
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@This document (1.5 Vibration cause sound) is re-created by administrator on 01 August 2017
@


1.1
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@Initial revision
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    "content": "<h1>Vibration cause sound</h1>\r\n\r\n<p><span style=\"font-size:20px;\">You noticed that sound, in most of the designs, is generally produced by blowing, hitting or plucking. When two objects hit each other, they vibrate and the vibrations produce sound.</span></p>\r\n&nbsp;\r\n\r\n<table align=\"left\" border=\"1\" cellpadding=\"1\" cellspacing=\"1\" style=\"width: 800px;\">\r\n\t<tbody>\r\n\t\t<tr>\r\n\t\t\t<td>\r\n\t\t\t<p><span style=\"font-size:20px;\"><strong>For further exploration:</strong></span><img alt=\"1.5\" bell=\"\" src=\"/media/7/5/c/d3f3322e7e2d396e8283a2775fa7b0d5e9d2e9883d153ee598e51e168fa9b.jpg\" style=\"float: right; width: 250px;\" /></p>\r\n\r\n\t\t\t<ul>\r\n\t\t\t\t<li>\r\n\t\t\t\t<p><span style=\"font-size:20px;\">Some vibrations stay for a longer time, that is why we are able to listen to the sound for a longer time e.g.- vibrations of a bell, and of a steel plate.</span><br />\r\n\t\t\t\t&nbsp;</p>\r\n\t\t\t\t</li>\r\n\t\t\t\t<li><span style=\"font-size:20px;\">While some vibrations die out quickly and their sound stops immediately like the banging of the table, the stamping of your foot on the ground, the splashing of water&nbsp;on the floor.</span></li>\r\n\t\t\t</ul>\r\n\r\n\t\t\t<p style=\"text-align: center;\"><strong><span style=\"font-size:20px;\">What other examples can you think of?</span></strong></p>\r\n\t\t\t</td>\r\n\t\t</tr>\r\n\t</tbody>\r\n</table>\r\n<br />\r\n<br />\r\n<br />\r\n<br />\r\n<br />\r\n<br />\r\n<br />\r\n<br />\r\n<br />\r\n<br />\r\n<br />\r\n<br />\r\n<br />\r\n<br />\r\n&nbsp;\r\n<table border=\"1\" cellpadding=\"1\" cellspacing=\"1\" style=\"width: 800px;\">\r\n\t<tbody>\r\n\t\t<tr>\r\n\t\t\t<td>\r\n\t\t\t<p><span style=\"font-size:20px;\"><strong>Try it out:</strong><br />\r\n\t\t\t<br />\r\n\t\t\tRing a bicycle bell and cover it with your palm. You will notice that the vibrations stop immediately. </span></p>\r\n\r\n\t\t\t<p style=\"text-align: center;\"><span style=\"font-size:20px;\"><strong>Why do you think this happens?</strong></span></p>\r\n\t\t\t</td>\r\n\t\t</tr>\r\n\t</tbody>\r\n</table>\r\n<br />\r\n&nbsp;",
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