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@This document (4.2 A slinky spring) is re-created by administrator on 01 August 2017
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    "content": "<h1>Slinky spring</h1>\r\n\r\n<p><span style=\"font-size:20px;\">Let us try to see if a slinky spring could provide us clues on how does sound travels.<br />\r\nConsider a slinky spring&nbsp;kept on a table. You compress it by giving it a sudden jerk&nbsp;from one side.<br />\r\n<br />\r\nWatch the slow motion video given below. &nbsp;You can also try it out in your classroom.<br />\r\n&nbsp;</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-59903c3369602a015571bd84\">\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=\"59903c3369602a015571bd84\" width=\"480\"><source codecs=\"avc1.42E01E, mp4a.40.2\" crossorigin=\"anonymous\" preload=\"metadata\" src=\"/media/c/3/b/2525c3fd231983bd1d0218c7c68b49cbf389550cf09472683f19544142cfc.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; Video 4.2 (a): A&nbsp;single compression traveling along a slinky</span></strong><br />\r\n<span style=\"font-size:20px;\">&nbsp;<br />\r\nNow let us move our hand back and forth.<br />\r\n&nbsp;</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-59903b2469602a01576e4bdd\">\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=\"59903b2469602a01576e4bdd\" width=\"480\"><source codecs=\"avc1.42E01E, mp4a.40.2\" crossorigin=\"anonymous\" preload=\"metadata\" src=\"/media/9/6/8/dcbe38cf46990aecfd86ad727e02a8f8e43bbbfa359cf9d936e688802f369.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;Video 4.2 (b): Many compressions and rarefactions traveling along a slinky</span></strong><br />\r\n<br />\r\n<span style=\"font-size:20px;\">You can see that there are alternate regions where the slinky spring is compressed and where it is elongated. The diaphragm of a speaker also moves back&nbsp;and forth. It compresses the air when it moves forward and makes the air rarer/sparser/less dense when it moves backward. Just as these successive compressions and rarefactions that travel along the slinky, sound travels away from a speaker through air. Sound travels in the same way through liquids and solids too.</span></p>\r\n&nbsp;<br />\r\n&nbsp;",
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