{"id":7922,"date":"2026-07-07T13:58:24","date_gmt":"2026-07-07T08:28:24","guid":{"rendered":"https:\/\/enlightify.org\/?p=7922"},"modified":"2026-07-07T14:11:26","modified_gmt":"2026-07-07T08:41:26","slug":"ultrasonic-and-infrasonic-waves-and-their-applications","status":"publish","type":"post","link":"https:\/\/enlightify.org\/hi\/ultrasonic-and-infrasonic-waves-and-their-applications\/","title":{"rendered":"Ultrasonic and Infrasonic Waves and Their Applications"},"content":{"rendered":"\t\t
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Ultrasonic and Infrasonic Waves, and Their Applications<\/h1>\n\n

Introduction<\/h2>\n\n

\nHumans can hear only a limited range of sound frequencies. This range is called the audible range<\/strong> or human hearing range<\/strong>.\n<\/p>\n\n

\nHuman audible range = 20 Hz to 20 kHz<\/strong>\n<\/p>\n\n

\nSound waves with frequencies below or above this range cannot be heard by humans. However, such sound waves are very useful in science, medicine and technology.\n<\/p>\n\n

Types of Sound Waves Based on Frequency<\/h2>\n\n

\nOn the basis of frequency, sound waves can be divided into three main types:\n<\/p>\n\n\n\n\n\n\n
Type of Sound Wave<\/th>\nFrequency Range<\/th>\nCan Humans Hear?<\/th>\n<\/tr>\n\n
Infrasonic waves<\/td>\nLess than 20 Hz<\/td>\nNo<\/td>\n<\/tr>\n\n
Audible sound waves<\/td>\n20 Hz to 20 kHz<\/td>\nYes<\/td>\n<\/tr>\n\n
Ultrasonic waves<\/td>\nMore than 20 kHz<\/td>\nNo<\/td>\n<\/tr>\n<\/table>\n\n

Infrasonic Waves<\/h2>\n\n

\nSound waves with frequencies less than 20 Hz<\/strong> are called infrasonic waves<\/strong>.\n<\/p>\n\n

\nHumans cannot hear infrasonic waves because their frequency is below the human audible range.\n<\/p>\n\n

Applications of Infrasonic Waves<\/h3>\n\n
    \n
  • Infrasonic waves are used for detecting natural events such as earthquakes<\/strong>.<\/li>\n
  • They are used for detecting volcanic eruptions<\/strong>.<\/li>\n
  • They are also used for detecting severe storms<\/strong>.<\/li>\n
  • These waves are useful because they can travel long distances through air and the Earth.<\/li>\n<\/ul>\n\n

    Ultrasonic Waves<\/h2>\n\n

    \nSound waves with frequencies more than 20 kHz<\/strong> are called ultrasonic waves<\/strong>.\n<\/p>\n\n

    \nHumans cannot hear ultrasonic waves because their frequency is above the human audible range.\n<\/p>\n\n

    Applications of Ultrasonic Waves<\/h3>\n\n
      \n
    • Ultrasonic waves are used for imaging internal organs without surgery. This is called ultrasonography<\/strong>.<\/li>\n
    • They are used for breaking kidney stones into smaller pieces, which can then pass out of the body.<\/li>\n
    • They are used for ultrasonic welding<\/strong>.<\/li>\n
    • They are used for cleaning delicate machine parts in industries.<\/li>\n
    • They are used for detecting defects inside metal blocks during construction and industrial testing.<\/li>\n
    • They are used for locating objects when sound waves get reflected from them.<\/li>\n<\/ul>\n\n

      Diagram: Sound Waves Based on Frequency<\/h2>\n\n
      \n\n\n \n\n \n Sound Waves Based on Frequency\n <\/text>\n\n \n \n \n\n \n Increasing Frequency\n <\/text>\n\n \n \n \n\n \n 20 Hz\n <\/text>\n\n \n 20 kHz\n <\/text>\n\n \n \n \n Infrasonic\n <\/text>\n \n Less than 20 Hz\n <\/text>\n \n Not heard by humans\n <\/text>\n \n Earthquakes, storms\n <\/text>\n\n \n \n \n Audible\n <\/text>\n \n 20 Hz to 20 kHz\n <\/text>\n \n Heard by humans\n <\/text>\n \n Normal hearing range\n <\/text>\n\n \n \n \n Ultrasonic\n <\/text>\n \n More than 20 kHz\n <\/text>\n \n Not heard by humans\n <\/text>\n \n Medicine, industry\n <\/text>\n\n \n \n Below audible range\n <\/text>\n\n \n Audible range\n <\/text>\n\n \n Above audible range\n <\/text>\n\n \n \n \n Infrasonic and ultrasonic waves are outside the human audible range.\n <\/text>\n\n<\/svg>\n<\/div>\n\n

      Explanation of the Diagram<\/h2>\n\n

      \nThe diagram shows the classification of sound waves according to frequency. Sounds below 20 Hz<\/strong> are infrasonic waves. Sounds between 20 Hz<\/strong> and 20 kHz<\/strong> are audible to humans. Sounds above 20 kHz<\/strong> are ultrasonic waves.\n<\/p>\n\n

      Comparison of Infrasonic and Ultrasonic Waves<\/h2>\n\n\n\n\n\n\n\n
      Basis<\/th>\nInfrasonic Waves<\/th>\nUltrasonic Waves<\/th>\n<\/tr>\n\n
      Frequency<\/td>\nLess than 20 Hz<\/td>\nMore than 20 kHz<\/td>\n<\/tr>\n\n
      Human hearing<\/td>\nCannot be heard by humans<\/td>\nCannot be heard by humans<\/td>\n<\/tr>\n\n
      Main use<\/td>\nDetecting natural events<\/td>\nMedical and industrial applications<\/td>\n<\/tr>\n\n
      Examples<\/td>\nEarthquakes, volcanic eruptions, severe storms<\/td>\nUltrasonography, kidney stone treatment, welding, cleaning, defect detection<\/td>\n<\/tr>\n<\/table>\n\n

      Use of Ultrasonic Waves in Medicine<\/h2>\n\n

      \nUltrasonic waves are very useful in medicine because they can help in studying internal organs without surgery.\n<\/p>\n\n

      \nThis method is called ultrasonography<\/strong>. It helps doctors form images of internal organs.\n<\/p>\n\n

      \nUltrasonic waves are also used to break kidney stones into smaller pieces. These smaller pieces can then pass out of the body.\n<\/p>\n\n

      Use of Ultrasonic Waves in Industries<\/h2>\n\n

      \nUltrasonic waves are also useful in industries.\n<\/p>\n\n

        \n
      • They are used in ultrasonic welding.<\/li>\n
      • They are used for cleaning delicate machine parts.<\/li>\n
      • They are used for detecting defects inside metal blocks.<\/li>\n<\/ul>\n\n

        \nThis is useful during construction and industrial testing because internal defects may not be visible from outside.\n<\/p>\n\n

        Use of Sound Waves for Locating Objects<\/h2>\n\n

        \nSound waves can reflect from objects. This property is used to locate objects.\n<\/p>\n\n

        \nWhen ultrasonic waves are sent towards an object, they reflect back. By studying the reflected waves, the position of the object can be found.\n<\/p>\n\n

        \nThis idea is important in applications such as echolocation and sonar, which will be studied in the next topics.\n<\/p>\n\n

        Why These Waves are Important<\/h2>\n\n

        \nEven though humans cannot hear infrasonic and ultrasonic waves, they are very useful.\n<\/p>\n\n

          \n
        • Infrasonic waves help in studying natural events.<\/li>\n
        • Ultrasonic waves help in medical diagnosis and treatment.<\/li>\n
        • Ultrasonic waves help in industrial cleaning, welding and testing.<\/li>\n
        • Reflected ultrasonic waves help in locating objects.<\/li>\n<\/ul>\n\n

          Important Terms<\/h2>\n\n

          1. Audible Range<\/h3>\n

          \nThe range of frequencies that humans can hear is called the audible range. It is from 20 Hz to 20 kHz<\/strong>.\n<\/p>\n\n

          2. Infrasonic Waves<\/h3>\n

          \nSound waves with frequencies less than 20 Hz<\/strong> are called infrasonic waves.\n<\/p>\n\n

          3. Ultrasonic Waves<\/h3>\n

          \nSound waves with frequencies more than 20 kHz<\/strong> are called ultrasonic waves.\n<\/p>\n\n

          4. Ultrasonography<\/h3>\n

          \nThe use of ultrasonic waves for imaging internal organs without surgery is called ultrasonography.\n<\/p>\n\n

          5. Ultrasonic Welding<\/h3>\n

          \nThe use of ultrasonic waves for welding materials is called ultrasonic welding.\n<\/p>\n\n

          Important Points<\/h2>\n\n
            \n
          • Humans can hear sounds only from 20 Hz to 20 kHz<\/strong>.<\/li>\n
          • Sound waves below 20 Hz<\/strong> are called infrasonic waves.<\/li>\n
          • Sound waves above 20 kHz<\/strong> are called ultrasonic waves.<\/li>\n
          • Infrasonic and ultrasonic waves cannot be heard by humans.<\/li>\n
          • Infrasonic waves are used for detecting earthquakes, volcanic eruptions and severe storms.<\/li>\n
          • Ultrasonic waves are used in ultrasonography.<\/li>\n
          • Ultrasonic waves are used for breaking kidney stones into smaller pieces.<\/li>\n
          • Ultrasonic waves are used for ultrasonic welding and cleaning delicate machine parts.<\/li>\n
          • Ultrasonic waves are used for detecting defects inside metal blocks.<\/li>\n
          • Ultrasonic waves can be used to locate objects by studying reflected sound waves.<\/li>\n<\/ul>\n\n

            Conclusion<\/h2>\n\n

            \nInfrasonic and ultrasonic waves are sound waves outside the human audible range. Infrasonic waves have frequencies less than 20 Hz<\/strong>, while ultrasonic waves have frequencies more than 20 kHz<\/strong>. Humans cannot hear these waves, but they have many important uses. Infrasonic waves help in detecting natural events, while ultrasonic waves are used in medicine, industries and object detection.\n<\/p>\n\n\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>\n\t\t","protected":false},"excerpt":{"rendered":"

            Ultrasonic and Infrasonic Waves, and Their Applications Introduction Humans can hear only a limited range of sound frequencies. This range is called the audible range or human hearing range. Human audible range = 20 Hz to 20 kHz Sound waves with frequencies below or above this range cannot be heard by humans. However, such sound […]<\/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":"","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-7922","post","type-post","status-publish","format-standard","hentry","category-physics"],"_links":{"self":[{"href":"https:\/\/enlightify.org\/hi\/wp-json\/wp\/v2\/posts\/7922","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=7922"}],"version-history":[{"count":7,"href":"https:\/\/enlightify.org\/hi\/wp-json\/wp\/v2\/posts\/7922\/revisions"}],"predecessor-version":[{"id":7931,"href":"https:\/\/enlightify.org\/hi\/wp-json\/wp\/v2\/posts\/7922\/revisions\/7931"}],"wp:attachment":[{"href":"https:\/\/enlightify.org\/hi\/wp-json\/wp\/v2\/media?parent=7922"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/enlightify.org\/hi\/wp-json\/wp\/v2\/categories?post=7922"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/enlightify.org\/hi\/wp-json\/wp\/v2\/tags?post=7922"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}