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Chs. 17 & 18 - Waves III. Wave Behaviors  Reflection  Refraction  Diffraction  Interference.

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Presentation on theme: "Chs. 17 & 18 - Waves III. Wave Behaviors  Reflection  Refraction  Diffraction  Interference."— Presentation transcript:

1 Chs. 17 & 18 - Waves III. Wave Behaviors  Reflection  Refraction  Diffraction  Interference

2 A. Reflection  Reflection  when a wave strikes an object and bounces off incident beamreflected beam Normal

3 A. Reflection  Inversion  A transverse wave traveling to a fixed end or colliding with a denser medium will flip on its way back

4 A. Reflection  Reflecting light in a mirror  A type of transverse wave

5 A. Reflection  Ultrasonic waves Ultrasound Medical ImagingSONAR “Sound Navigation Ranging”

6 A. Reflection  RADAR  Radio detection and ranging

7 A. Reflection  Reverberation  echo effect produced by the reflection of sound Anechoic chamber - designed to eliminate reverberation.

8 B. Refraction  Refraction  bending of waves when passing from one medium to another  caused by a change in speed slower (more dense)  light bends toward the normal SLOWER FASTER faster (less dense)  light bends away from the normal

9 B. Refraction  Surface waves (ocean waves)  Do not travel throughout the entire medium  Refracted as the water depth changes  Bends toward the shore

10 B. Refraction  Refraction of light depends on…  speed of light in the medium  wavelength of the light - shorter wavelengths (blue) bend more

11 B. Refraction  Example: View explanation.explanation.

12 B. Refraction  Example:  The “broken” pencil

13 C. Diffraction  Diffraction  bending of waves around a barrier  Smaller opening = more diffraction

14 C. Diffraction  longer wavelengths (red, for light) bend more, especially when the opening is small - opposite of refraction

15 D. Interference  Interference – occurs when 2 or more waves overlap  constructive interference  2 or more waves combine to produce a wave with larger displacement Constructive - louder

16 D. Interference  destructive interference  2 or more waves combine to produce a wave with smaller displacement Destructive - softer

17 D. Interference  For light – brighter portions show constructive interference, darker show destructive interference

18 E. Cool Applications!  Fiber Optics  Total Internal Reflection when all light is reflected back into the denser medium

19 E. Cool Applications!  The “Broken Pencil”  refraction View animation and explanation of the “Broken Pencil.”animation and explanation of the “Broken Pencil.”

20 E. Cool Applications!  Rainbows  refraction-reflection-refraction

21 E. Cool Applications!  Diffraction Gratings  glass or plastic made up of many tiny parallel slits  may also be reflective  spectroscopes, reflective rainbow stickers, CD surfaces

22 E. Cool Applications!  Thin Films - Bubbles & Oil Slicks  interference results from double reflection

23 E. Cool Applications!  Blue Sky & Red Sunsets NOON less atmosphere less scattering blue sky, yellow sun SUNSET more atmosphere more scattering orange-red sky & sun Molecules in atmosphere scatter light rays. Shorter wavelengths (blue, violet) are scattered more easily.

24 E. Cool Applications!  Resonance  special case of forced vibration  object is induced to vibrate at its natural frequency


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