{"id":3741,"date":"2023-01-09T10:27:23","date_gmt":"2023-01-09T10:27:23","guid":{"rendered":"https:\/\/9thclass.deltapublications.in\/?page_id=3741"},"modified":"2025-12-19T09:04:40","modified_gmt":"2025-12-19T09:04:40","slug":"s-12-e-reflection-of-sound","status":"publish","type":"page","link":"https:\/\/9thclass.deltapublications.in\/index.php\/s-12-e-reflection-of-sound\/","title":{"rendered":"S-12.e Reflection Of Sound"},"content":{"rendered":"\n<h2 class=\"wp-block-heading has-text-align-center has-text-color\" style=\"color:#00056d;text-transform:uppercase\"><strong>Reflection 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\n<figure class=\"wp-block-image is-resized\"><img decoding=\"async\" src=\"https:\/\/media.geeksforgeeks.org\/wp-content\/uploads\/20230612114614\/Reflection-of-Sound-through-pipe.png?utm_source=chatgpt.com\" alt=\"https:\/\/media.geeksforgeeks.org\/wp-content\/uploads\/20230612114614\/Reflection-of-Sound-through-pipe.png?utm_source=chatgpt.com\" style=\"width:364px;height:auto\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image is-resized\"><img decoding=\"async\" src=\"https:\/\/media.geeksforgeeks.org\/wp-content\/uploads\/20230612114833\/Reflection-of-Sound-in-Auditorium.png?utm_source=chatgpt.com\" alt=\"https:\/\/media.geeksforgeeks.org\/wp-content\/uploads\/20230612114833\/Reflection-of-Sound-in-Auditorium.png?utm_source=chatgpt.com\" style=\"width:373px;height:auto\"\/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading has-large-font-size\">1\ufe0f\u20e3 What is Reflection of Sound?<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Reflection of sound<\/strong> is the bouncing back of sound waves when they strike a hard surface like a <strong>wall, cliff, or building<\/strong>.<\/li>\n\n\n\n<li>It is similar to the reflection of light but involves <strong>sound waves<\/strong>.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading has-large-font-size\">2\ufe0f\u20e3 Laws of Reflection of Sound<\/h3>\n\n\n\n<p>The reflection of sound follows the <strong>same laws as light<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Angle of incidence = Angle of reflection<\/strong><\/li>\n\n\n\n<li>The <strong>incident sound wave<\/strong>, <strong>reflected sound wave<\/strong>, and the <strong>normal<\/strong> all lie in the <strong>same plane<\/strong>.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading has-large-font-size\">3\ufe0f\u20e3 Echo \ud83c\udfa4<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>An <strong>echo<\/strong> is the repetition of sound heard after it reflects from a distant surface.<\/li>\n\n\n\n<li>For an echo to be heard clearly:\n<ul class=\"wp-block-list\">\n<li>Time gap \u2265 <strong>0.1 seconds<\/strong><\/li>\n\n\n\n<li>Distance of reflecting surface \u2265 <strong>17 meters<\/strong> (in air)<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Example: Shouting near a hill or inside a large empty hall.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading has-large-font-size\">4\ufe0f\u20e3 Multiple Reflection of Sound<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>When sound reflects <strong>more than once<\/strong>, it is called <strong>multiple reflection<\/strong>.<\/li>\n\n\n\n<li>Examples:\n<ul class=\"wp-block-list\">\n<li>Sound in <strong>concert halls<\/strong><\/li>\n\n\n\n<li><strong>Megaphones<\/strong>, <strong>loudhailers<\/strong><\/li>\n\n\n\n<li><strong>Stethoscope<\/strong><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading has-large-font-size\">5\ufe0f\u20e3 Uses of Reflection of Sound<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>SONAR<\/strong>: Used to measure depth of the sea and locate underwater objects.<\/li>\n\n\n\n<li><strong>Stethoscope<\/strong>: Helps doctors hear heartbeats.<\/li>\n\n\n\n<li><strong>Soundboards<\/strong> in auditoriums help distribute sound evenly.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading has-large-font-size\">6\ufe0f\u20e3 Reverberation \ud83d\udd01<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Reverberation<\/strong> is the persistence of sound caused by repeated reflections in an enclosed space.<\/li>\n\n\n\n<li>Too much reverberation makes sound <strong>unclear<\/strong>.<\/li>\n\n\n\n<li>Reduced by using:\n<ul class=\"wp-block-list\">\n<li>Curtains<\/li>\n\n\n\n<li>Carpets<\/li>\n\n\n\n<li>Acoustic panels<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading has-large-font-size\">7\ufe0f\u20e3 Difference Between Echo and Reverberation<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Echo<\/th><th>Reverberation<\/th><\/tr><\/thead><tbody><tr><td>Heard as a <strong>distinct sound<\/strong><\/td><td>Sound overlaps and continues<\/td><\/tr><tr><td>Requires large distance<\/td><td>Occurs in enclosed spaces<\/td><\/tr><tr><td>Time gap \u2265 0.1 s<\/td><td>Time gap &lt; 0.1 s<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading has-large-font-size\">8\ufe0f\u20e3 Important Exam Points \u2b50<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Reflection of sound helps us <strong>hear sounds clearly in halls<\/strong>.<\/li>\n\n\n\n<li>Hard surfaces reflect sound better than soft surfaces.<\/li>\n\n\n\n<li>Used in <strong>medical<\/strong>, <strong>marine<\/strong>, and <strong>communication<\/strong> fields.<\/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\/82475\/179\/575\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-2-56.png\" alt=\"\" class=\"wp-image-6508\" srcset=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-2-56.png 500w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-2-56-300x300.png 300w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-2-56-150x150.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\/971\/423\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-1-59.png\" alt=\"\" class=\"wp-image-6509\" srcset=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-1-59.png 500w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-1-59-300x300.png 300w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-1-59-150x150.png 150w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/figure>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Reflection Of Sound Key Notes: 1\ufe0f\u20e3 What is Reflection of Sound? 2\ufe0f\u20e3 Laws of Reflection of Sound The reflection of sound follows the same laws as light: 3\ufe0f\u20e3 Echo \ud83c\udfa4 4\ufe0f\u20e3 Multiple Reflection of Sound 5\ufe0f\u20e3 Uses of Reflection of Sound 6\ufe0f\u20e3 Reverberation \ud83d\udd01 7\ufe0f\u20e3 Difference Between Echo and Reverberation Echo Reverberation Heard as a<a class=\"more-link\" href=\"https:\/\/9thclass.deltapublications.in\/index.php\/s-12-e-reflection-of-sound\/\">Continue reading <span class=\"screen-reader-text\">&#8220;S-12.e Reflection Of Sound&#8221;<\/span><\/a><\/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-3741","page","type-page","status-publish","hentry","entry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/3741","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=3741"}],"version-history":[{"count":15,"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/3741\/revisions"}],"predecessor-version":[{"id":18335,"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/3741\/revisions\/18335"}],"wp:attachment":[{"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/media?parent=3741"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}