Interactions of Sound Waves Sound Quality

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Interactions of Sound Waves Sound Quality

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Presentation transcript:

Interactions of Sound Waves Sound Quality Unit 13 Section 3 Sound

I. Reflection of Sound Waves A reflection is the bouncing back of a wave after it hits a barrier. A reflected sound wave is known as an echo. Sound waves reflect best off of smooth, hard surfaces. That’s why you can hear an echo in an empty gymnasium better than in an auditorium.

II. What is Echolocation? Echolocation is the use of reflected sound waves to find objects. Animals like dolphins, bats and birds use echolocation to hunt for food and find objects. Echolocation helps them to tell how far away something is based on how long it takes the sound waves to echo back to their ears.

Echolocation

Echolocation animation http://www.youtube.com/watch?v=5mwoOyOleGc http://video.search.yahoo.com/search/video;_ylt=A2KLqIIuIzJXuwUAzkj8w8QF;_ylu=X3oDMTExcjk4YWtiBHNlYwNjZC1jbG9zZQRzbGsDY2xvc2UEdnRpZANCMTk2MA--?ei=UTF-8&p=sonic+boom&fr2=p%3As%2Cv%3Av&vm=r#id=15&vid=4b30d8a46e79aabe0ec69a0f88060239&action=view

III. Echolocation Technology Sonar is a type of electronic echolocation. It can help: fisherman locate fish ship captains locate icebergs oceanographers map the ocean floor.

Ultrasonography is a medical procedure that uses echoes to ‘see’ inside a patient’s body without surgery.

IV. What is a Sonic Boom? When a jet flies at supersonic speeds (speeds faster than the speed of sound), it overcomes the compressed sound waves in front of it. Those sound waves crash together and spread behind the jet and create a shock wave. A sonic boom is the explosive sound heard when a shock wave reaches your ear.

Video of a Sonic Boom http://www.youtube.com/watch?v=-d9A2oq1N38

http://video. search. yahoo. com/video/play http://video.search.yahoo.com/video/play?p=sonic+boom&ei=UTF-8&vs=feedproxy.google.com&vid=0001865709286

Quickie Quiz An echo is most likely to result when sound hits a surface that is: Bumpy and soft Smooth and soft Smooth and hard Bumpy and hard

Quickie Quiz The use of reflected sound waves to find food or other objects is called: Sound wave Echolocation Resonance Decibel

Quickie Quiz The use of sound waves to look inside the body is known as Echolocation Sonic booms Ultrasonography Fish finder

Quickie Quiz A sonic boom occurs because Sound waves are reflecting. Sound waves get compressed in front of the jet and then trail off behind it. Sound waves move from the back of the jet forward. Sound waves are absorbing.