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1.1
date	2017.10.30.12.07.18;	author root;	state Exp;
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@This document (2.2 Pitch ) is re-created by administrator on 01 August 2017
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1.1
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@Initial revision
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    "content": "<h1>Pitch</h1>\r\n\r\n<p><span style=\"font-size:20px;\">A shrill or piercing sound is also called a high-pitch sound.</span></p>\r\n\r\n<p><span style=\"font-size:20px;\">We use one more term for shrillness that is </span><span style=\"font-size:20px;\">pitch</span><span style=\"font-size:20px;\">. Shriller the sound higher the pitch. For e.g. sound of buffalo and of goat. Goat\u2019s sound is shriller than </span><span style=\"font-size:20px;\">buffalo\u2019s</span><span style=\"font-size:20px;\"> sound. So, we can say that the goat has a high pitched voice and </span><span style=\"font-size:20px;\">buffalo</span><span style=\"font-size:20px;\"> has a low pitched voice.</span></p>\r\n\r\n<p>&nbsp;</p>\r\n\r\n<p><span style=\"font-size:20px;\">Below is a video in which you can see the difference between a less shrill and a more shrill sound.</span><br />\r\n<script type=\"text/javascript\" src=\"/static/ndf/bower_components/videojs/dist/video.min.js\"></script> <script type=\"text/javascript\" src=\"/static/ndf/bower_components/videojs/dist/video.js\"></script></p>\r\n\r\n<div>\r\n<div class=\"video-player-area\" id=\"video-player-59941baf69602a01551ff6a1\">\r\n<div class=\"vidbak\">\r\n<video class=\"video-js vjs-skin-colors-clix vjs-big-play-button center\" controls=\"controls\" data-setup=\"{ &quot;playbackRates&quot;: [0.5, 1, 1.5, 2] }\" height=\"360\" id=\"59941baf69602a01551ff6a1\" width=\"480\"><source codecs=\"avc1.42E01E, mp4a.40.2\" crossorigin=\"anonymous\" preload=\"metadata\" src=\"/media/3/b/e/35bbf4a0ed2725e3e6cd7e5c89cfdfd0db2dc32b7d40b6c27f20c94df3e44.mp4\" type=\"video/mp4\" /> <script>\r\n\t\t\tfunction myFunction() { \r\n\t\t\t    var vid = document.getElementById(id);\r\n\t\t\t    document.getElementById(\"mySpan\").innerHTML = \"Seeking: \" + vid.seeking;\r\n\t\t\t} \r\n\t\t\tfunction togglerTranscript(a){\r\n                $(a).next(\".transcript-data\").toggleClass(\"hide\");\r\n            };\r\n         \r\n\t\t\t</script> <!-- adding captions in different language--></video>\r\n</div>\r\n</div>\r\n</div>\r\n\r\n<p><strong><span style=\"font-size:18px;\">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Video 2.2: Straw flute</span></strong></p>\r\n\r\n<p><br />\r\n<span style=\"font-size:20px;\">We saw that sound is vibrations. The number of times a particle/object vibrates in a second is called frequency. If it vibrates</span><span style=\"font-size:20px;\">more</span><span style=\"font-size:20px;\"> number of times in a given time, we say that its frequency is higher. </span><span style=\"font-size:20px;\">Frequency</span><span style=\"font-size:20px;\"> of vibrations </span><span style=\"font-size:20px;\">decide</span><span style=\"font-size:20px;\"> the pitch of the sound. Higher the frequency higher the pitch, lower the frequency lower the pitch.</span></p>\r\n&nbsp;\r\n\r\n<p class=\"western\" style=\"margin-bottom: 0cm; line-height: 150%\">&nbsp;</p>\r\n\r\n<table cellpadding=\"3\" cellspacing=\"0\" height=\"255\" width=\"721\">\r\n\t<colgroup>\r\n\t\t<col width=\"657\" />\r\n\t</colgroup>\r\n\t<tbody>\r\n\t\t<tr>\r\n\t\t\t<td bgcolor=\"#ffffff\" style=\"border: 1px solid #000001; padding-top: 0.1cm; padding-bottom: 0.1cm; padding-left: 0.09cm; padding-right: 0.1cm\" valign=\"top\" width=\"657\">\r\n\t\t\t<p><span style=\"font-size:20px;\">For further exploration:<br />\r\n\t\t\t<br />\r\n\t\t\tWhat is the frequency of the rotation of ceiling fan?<br />\r\n\t\t\t<br />\r\n\t\t\tAs a ceiling fan speeds up, beyond a point we are not able to see its blades. This is a limitation of our eyes - we can't see things that move too quickly. The sound vibrations also occur too rapidly for us to observe them. For e.g. if we look at a speaker (watch the video in 4.1), we can see that it vibrates but we are not able to count the number of times it vibrates in a given time.</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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