{"id":3979,"date":"2023-01-09T10:44:29","date_gmt":"2023-01-09T10:44:29","guid":{"rendered":"https:\/\/8thclass.deltapublications.in\/?page_id=3979"},"modified":"2025-11-21T09:56:37","modified_gmt":"2025-11-21T09:56:37","slug":"s-13-f-audible-and-inaudible-sounds","status":"publish","type":"page","link":"https:\/\/8thclass.deltapublications.in\/index.php\/s-13-f-audible-and-inaudible-sounds\/","title":{"rendered":"s-13.f Audible And Inaudible Sounds"},"content":{"rendered":"\n<h2 class=\"wp-block-heading has-text-align-center has-text-color has-huge-font-size\" style=\"color:#00056d;text-transform:uppercase\"><strong>Audible And Inaudible Sounds<\/strong><\/h2>\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\" style=\"flex-basis:100%\">\n<div style=\"position: relative; width: 100%; height: 0; padding-top: 56.2500%;\n padding-bottom: 0; box-shadow: 0 2px 8px 0 rgba(63,69,81,0.16); margin-top: 1.6em; margin-bottom: 0.9em; overflow: hidden;\n border-radius: 8px; will-change: transform;\">\n  <iframe loading=\"lazy\" style=\"position: absolute; width: 100%; height: 100%; top: 0; left: 0; border: none; padding: 0;margin: 0;\"\n    src=\"https:\/\/www.canva.com\/design\/DAF7PbVGz40\/PjQSpOEVXVPO-TjXgeilQg\/watch?embed\" allowfullscreen=\"allowfullscreen\" allow=\"fullscreen\">\n  <\/iframe>\n<\/div>\n<a href=\"https:&#x2F;&#x2F;www.canva.com&#x2F;design&#x2F;DAF7PbVGz40&#x2F;PjQSpOEVXVPO-TjXgeilQg&#x2F;watch?utm_content=DAF7PbVGz40&amp;utm_campaign=designshare&amp;utm_medium=embeds&amp;utm_source=link\" target=\"_blank\" rel=\"noopener\">audible and inaudible sounds<\/a> by Delta publications\n<\/div>\n<\/div>\n\n\n\n<p class=\"has-text-color has-link-color has-huge-font-size wp-elements-8550df6181cd5d83aa7a08ef336a4ca1\" style=\"color:#74008b\">Key Notes :<\/p>\n\n\n\n<p class=\"has-text-color has-link-color has-large-font-size wp-elements-8b52c374f3942b0748ac80666c290f16\" style=\"color:#000060\"><strong>Definition of Sound:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li>Sound is a form of energy that travels through a medium (such as air, water, or solids) in the form of vibrations.<\/li>\n\n\n\n<li>It is produced when an object vibrates, causing the surrounding medium to vibrate as well.<\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-color has-link-color has-large-font-size wp-elements-9b35fcd541ae0be3378759b396ad08dd\" style=\"color:#000060\"><strong>Audible Sounds:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li><strong>Audible sounds<\/strong> are the sounds that can be heard by the human ear.<\/li>\n\n\n\n<li>The frequency range of audible sounds is <strong>20 Hz to 20,000 Hz (20 kHz)<\/strong>.<\/li>\n\n\n\n<li>Most humans, especially younger people, can hear sounds within this frequency range.<\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-color has-link-color has-large-font-size wp-elements-4ad6e345f609ba997d83a5621f3933c5\" style=\"color:#000060\"><strong>Inaudible Sounds:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li><strong>Inaudible sounds<\/strong> are those that cannot be heard by the human ear.<\/li>\n\n\n\n<li>They are categorized into two types:\n<ul class=\"wp-block-list\">\n<li><strong>Infrasonic sounds<\/strong>: Frequencies <strong>below 20 Hz<\/strong> (e.g., vibrations caused by earthquakes).<\/li>\n\n\n\n<li><strong>Ultrasonic sounds<\/strong>: Frequencies <strong>above 20,000 Hz (20 kHz)<\/strong> (e.g., sounds used by bats, dolphins, and ultrasound machines).<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-color has-link-color has-large-font-size wp-elements-42f009674656e541c7c9125fedde9e07\" style=\"color:#000060\"><strong>Examples of Audible and Inaudible Sounds:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li><strong>Audible sounds<\/strong>: Music, human speech, animal sounds, and sounds produced by musical instruments.<\/li>\n\n\n\n<li><strong>Infrasonic sounds<\/strong>: Natural phenomena like earthquakes, volcanoes, and waves crashing.<\/li>\n\n\n\n<li><strong>Ultrasonic sounds<\/strong>: Dog whistles, medical ultrasounds, and sonar systems.<\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-color has-link-color has-large-font-size wp-elements-d1bc345e0eceea5f15258bfcc0738824\" style=\"color:#000060\"><strong>Applications of Inaudible Sounds:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li><strong>Ultrasonic waves<\/strong> are used in <strong>medical imaging<\/strong>, such as ultrasounds, to view internal organs.<\/li>\n\n\n\n<li><strong>Sonar (Sound Navigation and Ranging)<\/strong> uses ultrasonic waves for underwater navigation, object detection, and mapping.<\/li>\n\n\n\n<li><strong>Infrasonic waves<\/strong> are used in the study of natural disasters like earthquakes and volcanoes.<\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-color has-link-color has-large-font-size wp-elements-d0bd8b5403fd7d603457550d34405ad5\" style=\"color:#000060\"><strong>Human Hearing Limitations:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li>The ability to hear high-frequency sounds decreases with age.<\/li>\n\n\n\n<li>Animals like dogs, bats, and dolphins can hear ultrasonic sounds that humans cannot.<\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-color has-link-color has-large-font-size wp-elements-687fcecff742c5b7a9fd01ee9b203bf1\" style=\"color:#000060\"><strong>Importance of Frequency and Pitch:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li><strong>Frequency<\/strong> is the number of vibrations per second, measured in <strong>Hertz (Hz)<\/strong>.<\/li>\n\n\n\n<li><strong>Pitch<\/strong> refers to how high or low a sound seems to a listener. Higher frequencies correspond to higher pitches.<\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-color has-link-color has-large-font-size wp-elements-9d4ecc9a71963e93160f45d3a7b5b064\" style=\"color:#000060\"><strong>Factors Affecting Audibility:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li><strong>Intensity of sound<\/strong>: Sounds that are too faint (low intensity) may not be heard, even if they are within the audible frequency range.<\/li>\n\n\n\n<li><strong>Hearing impairments<\/strong>: Certain conditions can affect a person&#8217;s ability to hear sounds within the normal audible range.<\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-color has-link-color has-large-font-size wp-elements-d512fdffc8925992b288d4efe7db58ae\" style=\"color:#000060\"><strong>Everyday Applications:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li>Devices like <strong>hearing aids<\/strong> amplify audible sounds to help those with hearing loss.<\/li>\n\n\n\n<li>Ultrasonic sensors are used in <strong>car parking systems<\/strong> and <strong>burglar alarms<\/strong>.<\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-color has-link-color has-large-font-size wp-elements-9b0dc66e7c6fb0979db57aab81518c0d\" style=\"color:#000060\"><strong>Summary:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li>Audible sounds are within the range of human hearing, while inaudible sounds fall outside this range.<\/li>\n\n\n\n<li>Understanding audible and inaudible sounds is crucial for applications in technology, medicine, and environmental science.<\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-color has-large-font-size\" style=\"color:#d90000\">Let&#8217;s practice!<\/p>\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\/81362\/587\/839\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/8thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-2-124.png\" alt=\"\" class=\"wp-image-7895\" srcset=\"https:\/\/8thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-2-124.png 500w, https:\/\/8thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-2-124-300x300.png 300w, https:\/\/8thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-2-124-150x150.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\/81359\/540\/504\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/8thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-1-122.png\" alt=\"\" class=\"wp-image-7896\" srcset=\"https:\/\/8thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-1-122.png 500w, https:\/\/8thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-1-122-300x300.png 300w, https:\/\/8thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-1-122-150x150.png 150w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/figure>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Audible And Inaudible Sounds audible and inaudible sounds by Delta publications Key Notes : Definition of Sound: Audible Sounds: Inaudible Sounds: Examples of Audible and Inaudible Sounds: Applications of Inaudible Sounds: Human Hearing Limitations: Importance of Frequency and Pitch: Factors Affecting Audibility: Everyday Applications: Summary: 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-3979","page","type-page","status-publish","hentry","entry"],"aioseo_notices":[],"_hostinger_reach_plugin_has_subscription_block":false,"_hostinger_reach_plugin_is_elementor":false,"_links":{"self":[{"href":"https:\/\/8thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/3979","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/8thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/8thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/8thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/8thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/comments?post=3979"}],"version-history":[{"count":15,"href":"https:\/\/8thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/3979\/revisions"}],"predecessor-version":[{"id":22372,"href":"https:\/\/8thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/3979\/revisions\/22372"}],"wp:attachment":[{"href":"https:\/\/8thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/media?parent=3979"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}