{"id":7748,"date":"2026-07-07T11:41:28","date_gmt":"2026-07-07T06:11:28","guid":{"rendered":"https:\/\/enlightify.org\/?p=7748"},"modified":"2026-07-07T11:50:51","modified_gmt":"2026-07-07T06:20:51","slug":"vibration-and-source-of-sound","status":"publish","type":"post","link":"https:\/\/enlightify.org\/hi\/vibration-and-source-of-sound\/","title":{"rendered":"Vibration and Source of Sound"},"content":{"rendered":"
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Vibration and Source of Sound<\/h1>\n\n

Introduction<\/h2>\n\n

\nIn the previous topic, we learnt that sound is produced by vibrating objects. Whenever we hear a sound, there is always some object or part of an object that is vibrating.\n<\/p>\n\n

\nFor example, the string of a guitar, the membrane of a drum, the metal body of a bell, the air column inside a flute, and the vocal cords in our throat vibrate to produce sound.\n<\/p>\n\n

Vibration<\/h2>\n\n

\nVibration is the periodic to and fro motion of an object about its mean position.\n<\/p>\n\n

\nVibration = Periodic to and fro motion<\/strong>\n<\/p>\n\n

\nWhen an object vibrates, it moves repeatedly on both sides of its normal or mean position. This motion produces sound.\n<\/p>\n\n

Example of Vibration<\/h2>\n\n

\nWhen a stretched rubber band is plucked, it starts moving rapidly to and fro. This rapid motion is called vibration.\n<\/p>\n\n

\nAs long as the rubber band vibrates, sound is produced. When the rubber band stops vibrating, the sound also stops.\n<\/p>\n\n

Figure<\/h2>\n\n
\n\n\n \n \n Vibration Produces Sound\n <\/text>\n\n \n \n\n Mean position<\/text>\n\n \n \n\n \n \n\n \n\n \n \n\n \n\n \n\n To and fro<\/text>\n motion<\/text>\n\n \n \n\n \n\n \n\n Sound waves<\/text>\n\n \n Vibrating string<\/text>\n String moves about its mean position<\/text>\n\n<\/svg>\n<\/div>\n\n

Explanation<\/h2>\n\n

\nThe above figure shows a vibrating string. The dotted line represents the mean position of the string. When the string is plucked, it moves to and fro about this mean position.\n<\/p>\n\n

\nThis repeated to and fro motion is called vibration. Due to these vibrations, sound waves are produced and travel through the surrounding medium.\n<\/p>\n\n

Mean Position<\/h2>\n\n

\nThe mean position is the normal or central position of a vibrating object when it is at rest.\n<\/p>\n\n

\nDuring vibration, the object moves on both sides of this mean position.\n<\/p>\n\n

Source of Sound<\/h2>\n\n

\nThe object that produces sound is called the source of sound<\/strong>.\n<\/p>\n\n

\nSource of sound = Object that produces sound<\/strong>\n<\/p>\n\n

\nEvery sound has a source. The source may be a string, membrane, air column, metal body, vocal cord, or any other vibrating object.\n<\/p>\n\n

Examples of Sources of Sound<\/h2>\n\n\n\n\n\n\n\n\n\n\n
Sound Producing Object<\/th>\nSource of Sound<\/th>\nVibrating Part<\/th>\n<\/tr>\n\n
Guitar<\/td>\nGuitar string<\/td>\nString<\/td>\n<\/tr>\n\n
Drum<\/td>\nDrum membrane<\/td>\nStretched membrane<\/td>\n<\/tr>\n\n
Flute<\/td>\nAir inside flute<\/td>\nAir column<\/td>\n<\/tr>\n\n
Bell<\/td>\nBell body<\/td>\nMetal body<\/td>\n<\/tr>\n\n
Human voice<\/td>\nVoice box<\/td>\nVocal cords<\/td>\n<\/tr>\n\n
Whistle<\/td>\nAir inside whistle<\/td>\nAir column<\/td>\n<\/tr>\n\n<\/table>\n\n

Different Vibrating Parts That Produce Sound<\/h2>\n\n

1. Vibrating Strings<\/h3>\n\n

\nIn some musical instruments, stretched strings vibrate and produce sound.\n<\/p>\n\n

    \n
  • Guitar<\/li>\n
  • Sitar<\/li>\n
  • Violin<\/li>\n
  • Rubber band<\/li>\n<\/ul>\n\n

    2. Vibrating Membranes<\/h3>\n\n

    \nIn drums and similar instruments, a stretched membrane vibrates and produces sound.\n<\/p>\n\n

      \n
    • Drum<\/li>\n
    • Tabla<\/li>\n
    • Dholak<\/li>\n<\/ul>\n\n

      3. Vibrating Air Columns<\/h3>\n\n

      \nIn wind instruments, the air column inside the instrument vibrates and produces sound.\n<\/p>\n\n

        \n
      • Flute<\/li>\n
      • Whistle<\/li>\n
      • Shehnai<\/li>\n<\/ul>\n\n

        4. Vibrating Metal Bodies<\/h3>\n\n

        \nSome metal objects produce sound when they vibrate after being struck.\n<\/p>\n\n

          \n
        • Bell<\/li>\n
        • Metal plate<\/li>\n
        • Tuning fork<\/li>\n<\/ul>\n\n

          5. Vibrating Vocal Cords<\/h3>\n\n

          \nIn humans, sound is produced by the vibration of vocal cords present inside the voice box or larynx.\n<\/p>\n\n

          \nWhen we speak or sing, our vocal cords vibrate and produce sound. The tongue, lips, mouth, and nasal cavity help convert this sound into speech or music.\n<\/p>\n\n

          How Animals Produce Sound<\/h2>\n\n

          \nMany animals also produce sound by vibrating body parts.\n<\/p>\n\n

            \n
          • \nHumans produce sound by vibrating vocal cords.\n<\/li>\n\n
          • \nBirds produce sound using their sound-producing organs.\n<\/li>\n\n
          • \nGrasshoppers and crickets produce sound by rubbing their wings or legs.\n<\/li>\n\n
          • \nSome animals produce sound by striking or rubbing certain body parts.\n<\/li>\n<\/ul>\n\n

            Important Relation Between Vibration and Sound<\/h2>\n\n

            \nVibration and sound are closely related. If vibration is present, sound can be produced. If vibration stops, sound also stops.\n<\/p>\n\n

            \nVibration present \u2192 Sound produced<\/strong>\n<\/p>\n\n

            \nVibration stops \u2192 Sound stops<\/strong>\n<\/p>\n\n

            Examples from Daily Life<\/h2>\n\n
              \n
            • \nWhen a school bell rings, its metal body vibrates and produces sound.\n<\/li>\n\n
            • \nWhen we pluck a guitar string, the string vibrates and produces sound.\n<\/li>\n\n
            • \nWhen a drum is beaten, its membrane vibrates and produces sound.\n<\/li>\n\n
            • \nWhen we speak, our vocal cords vibrate and produce sound.\n<\/li>\n\n
            • \nWhen air is blown into a flute, the air column inside it vibrates and produces sound.\n<\/li>\n\n
            • \nWhen a tuning fork is struck, its prongs vibrate and produce sound.\n<\/li>\n<\/ul>\n\n

              Important Points<\/h2>\n\n
                \n
              • \nSound is produced by vibrating objects.\n<\/li>\n\n
              • \nVibration is the periodic to and fro motion of an object about its mean position.\n<\/li>\n\n
              • \nThe mean position is the normal position of an object when it is at rest.\n<\/li>\n\n
              • \nThe object that produces sound is called the source of sound.\n<\/li>\n\n
              • \nEvery sound has a vibrating source.\n<\/li>\n\n
              • \nSound may be produced by vibrating strings, membranes, air columns, metal bodies, or vocal cords.\n<\/li>\n\n
              • \nWhen vibration stops, sound also stops.\n<\/li>\n\n
              • \nIn humans, sound is produced by vibrating vocal cords.\n<\/li>\n\n
              • \nIn many musical instruments, more than one part may vibrate to produce sound.\n<\/li>\n<\/ul>\n\n

                Conclusion<\/h2>\n\n

                \nVibration is the basic cause of sound production. When an object vibrates, it produces sound. The object that produces sound is called the source of sound. Different sources of sound have different vibrating parts, such as strings, membranes, air columns, metal bodies, and vocal cords. Therefore, to understand sound properly, it is necessary to understand vibration and the source of sound.\n<\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"

                Vibration and Source of Sound Introduction In the previous topic, we learnt that sound is produced by vibrating objects. Whenever we hear a sound, there is always some object or part of an object that is vibrating. For example, the string of a guitar, the membrane of a drum, the metal body of a bell, […]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"disabled","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[98],"tags":[],"class_list":["post-7748","post","type-post","status-publish","format-standard","hentry","category-physics"],"_links":{"self":[{"href":"https:\/\/enlightify.org\/hi\/wp-json\/wp\/v2\/posts\/7748","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/enlightify.org\/hi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/enlightify.org\/hi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/enlightify.org\/hi\/wp-json\/wp\/v2\/users\/9"}],"replies":[{"embeddable":true,"href":"https:\/\/enlightify.org\/hi\/wp-json\/wp\/v2\/comments?post=7748"}],"version-history":[{"count":4,"href":"https:\/\/enlightify.org\/hi\/wp-json\/wp\/v2\/posts\/7748\/revisions"}],"predecessor-version":[{"id":7755,"href":"https:\/\/enlightify.org\/hi\/wp-json\/wp\/v2\/posts\/7748\/revisions\/7755"}],"wp:attachment":[{"href":"https:\/\/enlightify.org\/hi\/wp-json\/wp\/v2\/media?parent=7748"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/enlightify.org\/hi\/wp-json\/wp\/v2\/categories?post=7748"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/enlightify.org\/hi\/wp-json\/wp\/v2\/tags?post=7748"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}