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PPT ON SOUND
 

PPT ON SOUND

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subject: physics

subject: physics
school : cbse

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    PPT ON SOUND PPT ON SOUND Presentation Transcript

    • SOUND DONE BY: NEVIL and louis wayne CLASS: IX-B
    • INDEX: What is Ultrasound? Some applications of ultrasound. What is SONAR? Some applications of SONAR. Quiz to test your knowledge..
    • What is Ultrasound? • Ultrasound is cyclic sound pressure with a frequency greater than the upper limit of human hearing, or high frequency waves. Ultrasound is thus not separated from "normal" (audible) sound based on differences in physical properties, only the fact that humans cannot hear it. Although this limit varies from person to person, it is approximately 20 kilohertz (20,000 hertz) in healthy, young adults. The production of ultrasound is used in many different fields, typically to penetrate a medium and measure the reflection signature or supply focused energy. The reflection signature can reveal details about the inner structure of the medium, a property also used by animals such as bats for hunting. back
    • Some applications of Ultrasound. • In industry, ultrasound is used to determine how thick objects such as metals and plastic are. • Ultrasound has been shown to work with antibiotics in killing bacterial cells. • Bacteria, particularly those in sewage, can be disintegrated (killed) by using ultrasonic waves. • Believe it or not, ultrasound can be used to clean teeth. Dental hygienists use ultrasound. • Focused pulses of ultrasound can break up kidney stones and gallstones into little fragments that can be passed from the body with less difficulty.
    • • Recently, studies have shown that ultrasound can stimulate the growth of bones. • Ultrasound is used in elastography. This allows doctors to work out which tissues in the body are healthy and which are unhealthy. • Ultrasonic waves are made to reflect from the heart to form the image of the heart. This is known as ‘echocardiography’. • Ultrasonic waves can be used to weld plastic together. The waves make heat energy between the objects that are joined. • Ultrasonic cleaners are used by jewelers and doctors to clean things like watches, jewelery, lenses and surgical instruments.
    • • • • • • • • Detection of developmental/ structural abnormalities in the fetus. Diagnosis of gallbladder disease/ obstruction. Evaluation of blood flow in blood vessels. Assessment of the thyroid gland in your neck. Evaluation of the heart and diagnosis of cardiac problems. Revealing the presence of infection in a specific area of the body. Determination of abnormal structures/ growth in a particular area. back
    • What is SONAR? • Sonar (originally an acronym for SOund Navigation And Ranging) is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate, communicate with or detect other vessels. Two types of technology share the name "sonar": passive sonar is essentially listening for the sound made by vessels; active sonar is emitting pulses of sounds and listening for echoes. Sonar may be used as a means of acoustic location and of measurement of the echo characteristics of "targets" in the water. Acoustic location in air was used before the introduction of radar. Sonar may also be used in air for robot navigation, and SODAR (an upward looking in-air sonar) is used for atmospheric investigations. The term sonar is also used for the equipment used to generate and receive the sound. The acoustic frequencies used in sonar systems vary from very low (infrasonic) to extremely high (ultrasonic). The study of underwater sound is known as underwater acoustics . back
    • Uses of SONAR: • It is used for communication between submerged submarines or between a submarine and a surface vessel • For locating mines and underwater hazards to navigation • Also as a fathometer, or depth finder. • Sonar is widely used by commercial fishermen for locating shoals of fish.
    • • Sonar (sound navigation and ranging) has many uses. It is used by the military to look for submarines (one of the reasons for which it was originally developed). • It is also used by the military and by ocean scientists to find out the depth of water and to map the contours of the ocean bottom. • Sonar is also used in a variety of other ways by oceanographers to study the everything from the ocean bottom to the waves on top. The technology can obviously be applied to the study of ocean life. • Sonar can also be used to look "below" the ocean bottom at the geologic structures below the ocean floor. Petrochemical explorers and others apply this technology.
    • • Certainly sonar has gained notoriety for being useful to find things lying on the ocean floor. (A number of famous ships that sunk have been located with it, like Titanic.) And it is used by fisherman for locating fish and for mapping terrain on the bottom of lakes or offshore fishing sites. • Sonar is used daily in the medical world to scan the inside of the human body and to look at unborn babies. Medical imaging is the most popular application of sonar. back
    • Series of Questions. Question 1 Question 2 Question 1 Question 3 Question 4 Question 5 NEXT
    • Question 1 Q1:What is Ultrasound? Low frequency waves. High frequency waves. None of these. back
    • Congratulations…. You got it correct!! back
    • Sorry……………. You got it wrong!! back
    • Question 2 Q2:What is the full form of SONAR? Sound Or Navigation And Ranging. Sound Of Navigation And Rating. SOund Navigation And Ranging. back
    • Congratulations…. You got it correct!! back
    • Sorry……………. You got it wrong!! back
    • Question 3 Q3:What is ‘echocardiography’ ? Ultrasonic waves are made to pass in the heart. Ultrasonic waves are made to reflect from the heart to form the image of the heart. Ultrasonic waves are passed through the stomach to view the inside content. back
    • Congratulations…. You got it correct!! back
    • Sorry……………. You got it wrong!! back
    • Question 4 Q4: Say TRUE or FALSE. ‘Ultrasound is used by dentists to clean teeth’ TRUE FALSE back
    • Congratulations…. You got it correct!! back
    • Sorry……………. You got it wrong!! back
    • Question 5 Q5: Where is SONAR installed? In areoplane or helicopter. In train and in bus In ship or a boat. back
    • Congratulations…. You got it correct!! back
    • Sorry……………. You got it wrong!! back