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Wave Interactions

Learn about wave reflection and refraction, including how waves bounce back after hitting a barrier and how they bend as they pass between different substances. Explore examples and take a quick quiz to test your knowledge.

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Wave Interactions

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  1. Wave Interactions Unit 12 Section 3

  2. I. Reflection • Sometimes a wave bounces back after hitting a barrier. • When the bouncing back of light, sound or heat takes place, it is called reflection. • An echo is a reflected sound wave. • When a wave hits a barrier and keeps moving through the barrier, the wave has been transmitted (sent through)through the barrier rather than reflecting back.

  3. http://video.search.yahoo.com/video/play?p=refraction&n=21&ei=utf-8&fr=yfp-t-907&fr2=tab-img&tnr=20&vid=000157376143http://video.search.yahoo.com/video/play?p=refraction&n=21&ei=utf-8&fr=yfp-t-907&fr2=tab-img&tnr=20&vid=000157376143

  4. II. Refraction • Refraction is the bending of a wave as the wave passes between two substances in which the speed of the wave differ. i. This makes the object appear bent. • This happens because you are putting the object in different media and the wavelength changes in different media. • Light waves travels slower through liquids than it does through gases (air) so the light wave slows down once it hits the water. • This change in speed causes the object to appear bent. http://www.kettering.edu/~drussell/Demos/refract/refract.html

  5. An example of refraction Medium is air As a result of the light waves hitting the spoon in the air and the water at an angle, the spoon appears bent. This is refraction. Medium is water

  6. http://video.search.yahoo.com/video/play?p=refraction&n=21&ei=utf-8&fr=yfp-t-907&fr2=tab-img&tnr=20&vid=000157376143http://video.search.yahoo.com/video/play?p=refraction&n=21&ei=utf-8&fr=yfp-t-907&fr2=tab-img&tnr=20&vid=000157376143

  7. Quickie Quiz ____________ happens when a wave passes from one medium to another at an angle. • Diffraction • Refraction • Reflection • Interference

  8. Quickie Quiz The bending of a wave around a barrier is called • Refraction • Diffraction • Reflection • Interference

  9. Quickie Quiz We can see the moon because of the ________________ of sunlight off it. • Refraction • Diffraction • Reflection • Interference

  10. Quickie Quiz • A reflected sound wave is a called an__________________.

  11. Quickie Quiz • Why does the spoon appear to bend in this picture?

  12. Quickie Quiz • When a wave hits a surface and keeps going, rather than bouncing off of it, the wave has been • Reflected • Transmitted • Echoed • Diffracted

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