{"id":3736,"date":"2023-01-09T10:25:32","date_gmt":"2023-01-09T10:25:32","guid":{"rendered":"https:\/\/9thclass.deltapublications.in\/?page_id=3736"},"modified":"2025-12-19T08:58:55","modified_gmt":"2025-12-19T08:58:55","slug":"s-12-c-production-of-sound","status":"publish","type":"page","link":"https:\/\/9thclass.deltapublications.in\/index.php\/s-12-c-production-of-sound\/","title":{"rendered":"S-12.c Production Of Sound"},"content":{"rendered":"\n<h2 class=\"wp-block-heading has-text-align-center has-text-color\" style=\"color:#00056d;text-transform:uppercase\"><strong>Production Of Sound<\/strong><\/h2>\n\n\n\n<p class=\"has-text-color has-huge-font-size\" style=\"color:#74008b\"><strong>Key Notes:<\/strong><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/tse2.mm.bing.net\/th\/id\/OIP.0uDkI8W2oD5Qn8TnHEolGwHaEt?cb=ucfimg2&amp;ucfimg=1&amp;utm_source=chatgpt.com&amp;w=474&amp;h=379&amp;c=7&amp;p=0\" alt=\"https:\/\/d1avenlh0i1xmr.cloudfront.net\/e2c0abca-f6f7-435f-9c99-9626ae4fe8da\/compressions-and-rarefactions---teachoo.png?utm_source=chatgpt.com\"\/><\/figure><\/div>\n\n\n<h3 class=\"wp-block-heading has-large-font-size\">1\ufe0f\u20e3 What is Sound?<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Sound is a form of energy<\/strong> that produces the sensation of hearing.<\/li>\n\n\n\n<li>It is produced when an <strong>object vibrates<\/strong>.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading has-large-font-size\">2\ufe0f\u20e3 How is Sound Produced?<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Sound is produced due to <strong>vibrations of objects<\/strong>.<\/li>\n\n\n\n<li>When an object vibrates, it makes the surrounding medium (air, water, etc.) vibrate.<\/li>\n\n\n\n<li>These vibrations travel as <strong>sound waves<\/strong>.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading has-large-font-size\">3\ufe0f\u20e3 Vibrating Objects Produce Sound<\/h3>\n\n\n\n<p>Examples:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Tuning fork<\/strong>: Vibrates when struck and produces sound.<\/li>\n\n\n\n<li><strong>Guitar strings<\/strong>: Vibrate when plucked.<\/li>\n\n\n\n<li><strong>Drum membrane<\/strong>: Vibrates when hit.<\/li>\n\n\n\n<li><strong>Human vocal cords<\/strong>: Vibrate to produce voice.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading has-large-font-size\">4\ufe0f\u20e3 Sound Needs a Medium<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Sound <strong>cannot travel in vacuum<\/strong>.<\/li>\n\n\n\n<li>It needs a <strong>material medium<\/strong> such as:\n<ul class=\"wp-block-list\">\n<li>Air (most common)<\/li>\n\n\n\n<li>Water<\/li>\n\n\n\n<li>Solids<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading has-large-font-size\">5\ufe0f\u20e3 Sound Waves<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Sound travels in the form of <strong>longitudinal waves<\/strong>.<\/li>\n\n\n\n<li>These waves consist of:\n<ul class=\"wp-block-list\">\n<li><strong>Compressions<\/strong>: Regions of high pressure<\/li>\n\n\n\n<li><strong>Rarefactions<\/strong>: Regions of low pressure<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading has-large-font-size\">6\ufe0f\u20e3 Production of Sound in Humans<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Humans produce sound using the <strong>larynx (voice box)<\/strong>.<\/li>\n\n\n\n<li>The <strong>vocal cords vibrate<\/strong> when air from the lungs passes through them.<\/li>\n\n\n\n<li>Tighter vocal cords \u2192 <strong>higher pitch<\/strong><\/li>\n\n\n\n<li>Looser vocal cords \u2192 <strong>lower pitch<\/strong><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading has-large-font-size\">7\ufe0f\u20e3 Sound and Vibration Relationship<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>More vibration = louder sound<\/strong><\/li>\n\n\n\n<li><strong>Faster vibration = higher pitch<\/strong><\/li>\n\n\n\n<li><strong>Slower vibration = lower pitch<\/strong><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading has-large-font-size\">8\ufe0f\u20e3 Loudness and Pitch (Basic Idea)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Loudness<\/strong> depends on the <strong>amplitude of vibration<\/strong>.<\/li>\n\n\n\n<li><strong>Pitch<\/strong> depends on the <strong>frequency of vibration<\/strong>.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading has-large-font-size\">9\ufe0f\u20e3 Examples from Daily Life<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ringing bell<\/li>\n\n\n\n<li>Playing musical instruments<\/li>\n\n\n\n<li>Speaking and singing<\/li>\n\n\n\n<li>Vehicle horns<\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-group has-large-font-size\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<p class=\"has-text-color has-large-font-size\" style=\"color:#d90000\">Let&#8217;s practice!<\/p>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/wordwall.net\/play\/82473\/544\/902\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-2-53.png\" alt=\"\" class=\"wp-image-6499\" srcset=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-2-53.png 500w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-2-53-300x300.png 300w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-2-53-150x150.png 150w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/wordwall.net\/play\/81561\/636\/199\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-1-56.png\" alt=\"\" class=\"wp-image-6500\" srcset=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-1-56.png 500w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-1-56-300x300.png 300w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-1-56-150x150.png 150w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/figure>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Production Of Sound Key Notes: 1\ufe0f\u20e3 What is Sound? 2\ufe0f\u20e3 How is Sound Produced? 3\ufe0f\u20e3 Vibrating Objects Produce Sound Examples: 4\ufe0f\u20e3 Sound Needs a Medium 5\ufe0f\u20e3 Sound Waves 6\ufe0f\u20e3 Production of Sound in Humans 7\ufe0f\u20e3 Sound and Vibration Relationship 8\ufe0f\u20e3 Loudness and Pitch (Basic Idea) 9\ufe0f\u20e3 Examples from Daily Life Let&#8217;s practice!<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"class_list":["post-3736","page","type-page","status-publish","hentry","entry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/3736","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/comments?post=3736"}],"version-history":[{"count":14,"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/3736\/revisions"}],"predecessor-version":[{"id":18329,"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/3736\/revisions\/18329"}],"wp:attachment":[{"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/media?parent=3736"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}