{"id":3743,"date":"2023-01-09T10:27:35","date_gmt":"2023-01-09T10:27:35","guid":{"rendered":"https:\/\/9thclass.deltapublications.in\/?page_id=3743"},"modified":"2025-12-19T09:04:43","modified_gmt":"2025-12-19T09:04:43","slug":"s-12-f-range-of-hearing","status":"publish","type":"page","link":"https:\/\/9thclass.deltapublications.in\/index.php\/s-12-f-range-of-hearing\/","title":{"rendered":"S-12.f Range Of Hearing"},"content":{"rendered":"\n<h2 class=\"wp-block-heading has-text-align-center has-text-color\" style=\"color:#00056d;text-transform:uppercase\"><strong>Range Of Hearing<\/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\n<figure class=\"wp-block-image is-resized\"><img decoding=\"async\" src=\"https:\/\/cdn.britannica.com\/04\/14304-050-1A5E3289\/structures-outer-ear.jpg?utm_source=chatgpt.com\" alt=\"https:\/\/cdn.britannica.com\/04\/14304-050-1A5E3289\/structures-outer-ear.jpg?utm_source=chatgpt.com\" style=\"width:473px;height:auto\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image is-resized\"><img decoding=\"async\" src=\"https:\/\/media.licdn.com\/dms\/image\/v2\/D4D22AQFu-HpD-dK6_A\/feedshare-shrink_1280\/B4DZk4c3WCIYAs-\/0\/1757588717443?e=2147483647&amp;t=tnRuGrolUs69oFDR2IIv4CLQ6KNuCmS9MPHLpQqcj0s&amp;v=beta&amp;utm_source=chatgpt.com\" alt=\"https:\/\/media.licdn.com\/dms\/image\/v2\/D4D22AQFu-HpD-dK6_A\/feedshare-shrink_1280\/B4DZk4c3WCIYAs-\/0\/1757588717443?e=2147483647&amp;t=tnRuGrolUs69oFDR2IIv4CLQ6KNuCmS9MPHLpQqcj0s&amp;v=beta&amp;utm_source=chatgpt.com\" style=\"width:491px;height:auto\"\/><\/figure>\n\n\n\n<p>4<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-large-font-size\">\ud83d\udd0a What is Range of Hearing?<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The <strong>range of hearing<\/strong> is the range of <strong>sound frequencies<\/strong> that the human ear can hear.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading has-large-font-size\">\ud83d\udc68\u200d\ud83d\udc69\u200d\ud83d\udc67 Human Range of Hearing<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Humans can hear sounds from <strong>20 Hz to 20,000 Hz (20 kHz)<\/strong>.<\/li>\n\n\n\n<li>Sounds <strong>below 20 Hz<\/strong> are called <strong>infrasonic sounds<\/strong>.<\/li>\n\n\n\n<li>Sounds <strong>above 20,000 Hz<\/strong> are called <strong>ultrasonic sounds<\/strong>.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading has-large-font-size\">\ud83d\udc18 Infrasonic Sounds (Below 20 Hz)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Not audible to humans.<\/li>\n\n\n\n<li><strong>Elephants and whales<\/strong> use infrasonic sounds for long-distance communication.<\/li>\n\n\n\n<li>These sounds can travel long distances through air and water.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading has-large-font-size\">\ud83e\udd87 Ultrasonic Sounds (Above 20,000 Hz)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Not audible to humans.<\/li>\n\n\n\n<li><strong>Bats and dolphins<\/strong> use ultrasonic sounds for <strong>echolocation<\/strong>.<\/li>\n\n\n\n<li>Used in <strong>medical imaging (ultrasound)<\/strong> and <strong>SONAR<\/strong>.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading has-large-font-size\">\ud83e\udde0 Factors Affecting Hearing<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Age<\/strong>: Hearing range reduces with age (especially high-frequency sounds).<\/li>\n\n\n\n<li><strong>Loud noise exposure<\/strong> can damage hearing.<\/li>\n\n\n\n<li><strong>Health of the ear<\/strong> also affects hearing ability.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading has-large-font-size\">\ud83d\udd14 Audible vs Loudness<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Frequency (Hz)<\/strong> determines <strong>pitch<\/strong> (high or low sound).<\/li>\n\n\n\n<li><strong>Amplitude<\/strong> determines <strong>loudness<\/strong>, not the hearing range.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading has-large-font-size\">\ud83d\udccc Key Terms to Remember<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Audible sound<\/strong>: 20 Hz \u2013 20,000 Hz<\/li>\n\n\n\n<li><strong>Infrasonic sound<\/strong>: Below 20 Hz<\/li>\n\n\n\n<li><strong>Ultrasonic sound<\/strong>: Above 20,000 Hz<\/li>\n\n\n\n<li><strong>Hz (Hertz)<\/strong>: Unit of frequency<\/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\/82476\/198\/356\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-2-57.png\" alt=\"\" class=\"wp-image-6511\" srcset=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-2-57.png 500w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-2-57-300x300.png 300w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-2-57-150x150.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\/81562\/010\/690\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-1-60.png\" alt=\"\" class=\"wp-image-6512\" srcset=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-1-60.png 500w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-1-60-300x300.png 300w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-1-60-150x150.png 150w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/figure>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Range Of Hearing Key Notes: 4 \ud83d\udd0a What is Range of Hearing? \ud83d\udc68\u200d\ud83d\udc69\u200d\ud83d\udc67 Human Range of Hearing \ud83d\udc18 Infrasonic Sounds (Below 20 Hz) \ud83e\udd87 Ultrasonic Sounds (Above 20,000 Hz) \ud83e\udde0 Factors Affecting Hearing \ud83d\udd14 Audible vs Loudness \ud83d\udccc Key Terms to Remember 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-3743","page","type-page","status-publish","hentry","entry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/3743","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=3743"}],"version-history":[{"count":13,"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/3743\/revisions"}],"predecessor-version":[{"id":18336,"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/3743\/revisions\/18336"}],"wp:attachment":[{"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/media?parent=3743"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}