Applications of Sound.ppt

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1、Applications of Sound,EQ: How are sound reflections and ultrasound used in daily life?,Reflection of Sound Waves,Occurs when a sound wave cannot pass through an object, the wave bounces back, or is reflected . A reflected sound is called an echo,EQ: How are sound reflections and ultrasound used in d

2、aily life?,Vocabulary,Sonar a system of detecting reflected sound waves used to determine Depth of the water Locate a sunken ship or cargo Locate boats on the ocean Sonar stands for sound navigation and ranging Navigation means finding your way Ranging means finding the distance between two objects,

3、EQ: How are sound reflections and ultrasound used in daily life?,Sonar,How does sonar work? Sonar machine, or depth finder, produces a burst of high frequency ultrasonic sound waves that travel through water The waves hit an object or the ocean floor, then they reflect back The sonar device measures

4、 the time it takes to detect the reflected sound wave The intensity of the reflected waves tells the size and the shape of the object,EQ: How are sound reflections and ultrasound used in daily life?,Ultrasound and Infrasound,Ultrasonic waves are sound waves higher than a human can hear Infrasonic wa

5、ves are sound waves lower than a human can hear Echolocation- the use of sound waves to determine distance or to locate objects,EQ: How are sound reflections and ultrasound used in daily life?,Ultrasound in the Ocean,Dolphins and whales use echolocation to identify prey and to find their way Fisherm

6、en attach ultrasonic beepers to their nets to keep dolphins away from their catch People wear ultrasonic beepers to keep sharks away when they dive,EQ: How are sound reflections and ultrasound used in daily life?,Ultrasound in Medicine,Sonograms ultrasound doctors use to get a picture of something i

7、nside the body,EQ: How are sound reflections and ultrasound used in daily life?,Ultrasound at home,Ultrasonic toothbrushes sound can reach into places the bristles cannot, cleaning your teeth better Jewelry cleaner sound vibrations shake dirt off your jewelry without causing damage Auto focus camera uses ultrasound to find the distance of an object,EQ: How are sound reflections and ultrasound used in daily life?,Class Work and Homework,Fill In What did I learn Confused SayRead pages 0 66 0 70, Questions 1-5, page O 70,EQ: How are sound reflections and ultrasound used in daily life?,