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WAVES

WAVES. What do these things have in common?. Think about what characteristics make these things similar and write them down. Characteristics of a Wave. Amplitude, A - the maximum displacement of wave. Characteristics of a Wave. Period, T -the time it takes to complete one cycle in seconds.

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WAVES

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  1. WAVES

  2. What do these things have in common?

  3. Think about what characteristics make these things similar and write them down.

  4. Characteristics of a Wave Amplitude, A - the maximum displacement of wave

  5. Characteristics of a Wave Period, T -the time it takes to complete one cycle in seconds

  6. Characteristics of a Wave Frequency, f -number of cycles/vibrations per unit of time. Unit is Hz - Hertz High f Low f

  7. Characteristic of a Wave • Wavelength, λ, length of a wave measured in meters.

  8. Relationship between period and frequency- it’s complicated… f = 1 / T frequency = 1 / Period or T = 1 / f Period = 1 / frequency

  9. Types of Waves Longitudinal Transverse Particles in the wave move perpendicular to the motion of the wave. Particles in the wave move parallel to the motion of the wave.

  10. Characteristics of Wave Types Longitudinal Transverse Crests, troughs, wavelengths λ Compression, rarefraction (stretching), wavelengths λ

  11. Draw Wave Label Transverse • Crests • Troughs • Wavelengths • Period • Amplitude

  12. Draw Wave Label Longitudinal • Compression • Rarefractions • Wavelengths • Period • Amplitude

  13. Speed of Wave Speed = distance / time Speed = amount of distance a wave travels / time it takes the wave to cover that distance

  14. Example Mac and Tosh are resting on top of the water near the end of the pool when Mac creates a surface wave. The wave travels the length of the pool and back in 25 seconds. The pool is 25 meters long. Determine the speed of the wave.

  15. Example The period of a wave is 0.0300 seconds. It travels at a velocity of 10.0 m/s. Determine the frequency and the wavelength of the wave.

  16. STANDING WAVES A standing wave is a traverse wave that does not travel. For this to happen, both ends of the waves need to be attached to something.

  17. Standing wave

  18. Standing wave http://www.acs.psu.edu/drussell/Demos/StandingWaves/StandingWaves.html

  19. Nodes and antinodes • Nodes- places of no displacement on a wave • Antinodes – midway between nodes and a place where displacement is at a maximum

  20. How many nodes/antinodes? • 5 nodes • 4 antinodes

  21. How many nodes/antinodes? • Nodes? • Antinodes?

  22. Interference • Interference is when waves add or subtract and interact with each other

  23. Types of Interference CONSTRUCTIVE DESTRUCTIVE Subtracting waves • Adding up of waves

  24. What kind of interference?

  25. Superposition Principle- the addition of waves http://www.sciencejoywagon.com/physicszone/09waves/ http://www.feilding.net/sfuad/musi3012-01/html/lectures/004_sound_III.htm

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