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The Behavior of Waves

The Behavior of Waves. Wave Speed. Remember: Waves change speed when they encounter a boundary and enter a new medium. Wave Speed. http://www.nisdtx.org/Page/42568 Click on the above link and select the video Wave Speed. Reflection.

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The Behavior of Waves

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  1. The Behavior of Waves

  2. Wave Speed • Remember: Waves change speed when they encounter a boundary and enter a new medium

  3. Wave Speed • http://www.nisdtx.org/Page/42568 • Click on the above link and select the video Wave Speed

  4. Reflection • Reflection- when a wave strikes an object and bounces off of it • All types of waves can be reflected • Light, sound, ocean, etc. • Used by bats and dolphins • All types of waves can be reflected • The angle of incidence of a wave is always equal to the angle of reflection. • http://www.acs.psu.edu/drussell/Demos/reflect/reflect.html

  5. Reflection • Normal- an imaginary line perpendicular to the reflective surface • Angle of Incidence- the angle formed by the wave striking the surface and the normal • Angle of Reflection- the angle formed by the reflected wave and the normal

  6. Refraction • Why does an object partially in the water look broken or disconnected? • Refraction- the bending of a wave caused by a change in the speed of the wave as it moves from one medium to another • Greater change in speed = more bending of the wave • When a wave moves into a medium that slows it down, the wave is bent toward normal • When a wave moves into a medium that allows it to speed up, the wave is bent away from normal

  7. Refraction • http://www.ps.missouri.edu/rickspage/refract/refraction.html • http://www.physicsclassroom.com/mmedia/waves/ltm.html • http://www.physicsclassroom.com/mmedia/optics/bp.html

  8. Refraction

  9. Diffraction • Diffraction- an object causes a wave to change direction and spread around or through a barrier • Refraction and diffraction both cause bending, but refraction occurs when waves enter a new medium, while diffraction occurs when waves pass around something while still in the same medium

  10. Diffraction • http://www.walter-fendt.de/ph14e/singleslit.htm • http://www.colorado.edu/physics/2000/schroedinger/two-slit2.html

  11. Diffraction

  12. Resonance • Resonance- the ability of an object to vibrate by absorbing energy at its natural frequency • Breaking a glass with sound- resonance: http://www.teachersdomain.org/resources/lsps07/sci/phys/energy/glassbreak/index.html

  13. Tacoma Narrows Bridge • Click the below link to watch the Tacoma Narrows Bridge Video • http://www.nisdtx.org/Page/42568

  14. Breaking Glass • Click on the link below to watch the Breaking Glass video • http://www.nisdtx.org/Page/42568

  15. Interference • http://www.acoustics.salford.ac.uk/feschools/waves/diffract.htm • Interference- the ability of two or more waves to overlap and combine to form a new wave • Waves pass right through each other and continue to travel in their original directions • A new wave exists only while the two original waves continue to overlap • Constructive interference- waves add together • Destructive interference- wave subtract from each other

  16. Interference- green- resulting wave

  17. Interference • http://id.mind.net/~zona/mstm/physics/waves/interference/intrfrnc.html

  18. Standing Waves • Standing waves- a wave pattern that stays in one place • Forms when waves of equal wavelength and amplitude travel in opposite directions- continuously interfering with each other • Nodes- places where the two waves always cancel each other • http://id.mind.net/~zona/mstm/physics/waves/standingWaves/standingWaves1/StandingWaves1.html • http://www.walter-fendt.de/ph14e/stwaverefl.htm

  19. Doppler Effect • Link on the link below to watch the video about the Big Bang Doppler Effect http://www.nisdtx.org/Page/42568

  20. Doppler Effect • http://www.youtube.com/watch?v=Tn35SB1_NYI • The change in frequency when there is relative motion between an observer of waves and the source of the waves • Doppler with Sound

  21. The Doppler effect- Change in frequency due to the source or receiver greater the speed the source, greater the Doppler effect Bug swimming Stationary bug Blue Shift-increase in frequency Red Shift- Decrease in frequency

  22. Doppler Effect • Blue Shift-increase in frequency Red Shift- Decrease in frequency

  23. Red Shift • Click on the link below to watch the video about Red Shift • http://www.nisdtx.org/Page/42568

  24. Bow waves • V-shaped pattern made by overlapping crest

  25. Shock Waves Produced by supersonic aircraft, three-dimensional cone shaped Sonic boom – sharp crack heard when conical shell of compressed air that sweeps behind a supersonic aircraft reaches listeners on the ground below.

  26. Supersonic • Subsonic - slower than the speed of sound • Supersonic- faster than the speed of sound

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