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1.2
date	2018.03.15.08.56.22;	author root;	state Exp;
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1.1
date	2018.03.15.07.47.50;	author root;	state Exp;
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desc
@This document (4.1 A speaker) is re-created by administrator on 01 August 2017
@


1.2
log
@This document (4.1 A speaker) is lastly updated by administrator status:PUBLISHED on 15 March 2018
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    "content": "<h1>Speaker</h1>\r\n\r\n<p><span style=\"font-size:20px;\">We use speakers to listen to music. Speakers are used in mobile phones and in televisions too. </span></p>\r\n\r\n<blockquote>\r\n<p><span style=\"font-size:20px;\">Have you ever observed or touched a speaker while it is producing sound?<br />\r\n<br />\r\nDoes its diaphragm vibrate?&nbsp;</span></p>\r\n</blockquote>\r\n\r\n<p><span style=\"font-size:20px;\">Let us watch a video of a speaker producing sound.</span><br />\r\n<br />\r\n&nbsp;</p>\r\n\r\n<p style=\"text-align: center;\"><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-599aad2669602a013fe2fd81\">\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=\"599aad2669602a013fe2fd81\" width=\"480\"><source codecs=\"avc1.42E01E, mp4a.40.2\" crossorigin=\"anonymous\" preload=\"metadata\" src=\"/media/0/5/c/5d78c276e640a24d6bf1892edabb60cdaf37b9ca2d6888973df0bc569f15e.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 style=\"text-align: center;\"><br />\r\n<span style=\"font-size:16px;\"><strong>Video 4.1(a) : Normal motion&nbsp;video of vibrating speaker</strong></span><br />\r\n<br />\r\n<br />\r\n<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-599aad8369602a0140b0655a\">\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=\"599aad8369602a0140b0655a\" width=\"480\"><source codecs=\"avc1.42E01E, mp4a.40.2\" crossorigin=\"anonymous\" preload=\"metadata\" src=\"/media/3/3/4/224df66f26e0cf58beb776f0dd6922ee958558fd3dd011d79423c4b154b2f.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 style=\"text-align: center;\"><br />\r\n<span style=\"font-size:16px;\"><strong>Video 4.1(b) : Slow motion video of vibrating speaker</strong></span><br />\r\n&nbsp;</p>\r\n\r\n<p><span style=\"font-size:20px;\">Sometimes speakers can create a nuisance, especially during festivals or marriages when someone plays loud music. </span></p>\r\n\r\n<blockquote>\r\n<p><span style=\"font-size:20px;\">But how does sound go forth from a speaker?</span></p>\r\n</blockquote>\r\n",
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@Initial revision
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