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Waves

Waves. Mrs. Quinn Spring 2010. Wave. A disturbance that transfers energy through matter or space When a wave moves through matter , the particles of matter do NOT move along with the wave. Only the energy that produces the wave moves with the wave.

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Waves

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  1. Waves Mrs. Quinn Spring 2010

  2. Wave • A disturbance that transfers energy through matter or space • When a wave moves through matter, the particles of matter do NOT move along with the wave. • Only the energy that produces the wave moves with the wave. http://oraclespeak.files.wordpress.com/2009/12/wave.jpg

  3. Example of Waves http://www.physicalgeography.net/fundamentals/images/epicenter.gif http://mendocoastcurrent.files.wordpress.com/2008/12/wave-ocean-blue-sea-water-white-foam-photo.jpg http://www.abc.net.au/science/features/quantum/img/wave.jpg http://hclibrary.org/teachernotes/wp-content/uploads/image/sound_wave.jpg

  4. Medium • Any substance or region through which a wave is transmitted • A medium transfer wave energy but has no overall movement itself energy is transmitted, but matter is not. http://odin.physastro.mnsu.edu/~eskridge/astr101/Surface_waves.jpg

  5. 2 Properties of a Medium that Affect the Speed of a Wave 1. Density • As density of medium increases, speed of a wave decreases. 2. Elasticity • This refers to the ability of a medium to return quickly to its original shape after being disturbed. • More elastic, the faster the wave.

  6. Example of Mediums • Water  Ocean Waves • Air  Sound Waves • All phases of Matter can act as a medium. • Light does not need a medium it can be transmitted through a vacuum.

  7. Review Questions • 1. How does a wave move through a medium? • 2. What are the 2 properties affect the speed of a wave? • 3. At 25 degrees Celsius, the speed of sound in the 346 m/s. At zero degrees, the speed of sound in air is 332 m/s. Explain why the speed decrease as the temperature decreases?

  8. Types of Waves • Wave are classified according to the motion of the medium as compared to the movement of the wave.

  9. Types of Waves • Transverse • A wave in the which the motion of the medium is at right angles to the direction of the wave. http://media.tiscali.co.uk/images/feeds/hutchinson/ency/c02631.jpg

  10. Types of Waves • Longitudinal • A wave that consists of a series of compression and rarefactions. • The motion of the medium is parallel to the direction of the wave.

  11. Motion of the Medium back and fourth. http://www.passmyexams.co.uk/GCSE/physics/images/long_waves.jpg

  12. Compression http://www.physicsclassroom.com/class/sound/u11l1c.cfm

  13. Compression • A space in the medium in which the molecules are crowded together.

  14. Rarefaction • A space in the medium in which there are fewer molecules. http://www.lcse.umn.edu/specs/labs/images/rarefaction_spring.gif

  15. Review Questions • 1. What are the 2 types of waves? • 2. Which type of wave is an ocean wave? • 3. Which type of wave is a sound wave?

  16. Review Questions • Suppose that a long line of people formed outside a movie theater and a person at the end of the line pushes the person in front of him. Everyone in line moves forward and then as people regain their balance then move back again. Which type of wave is generated? Why?

  17. http://gilmore2.chem.northwestern.edu/images2/e_simple1.gif

  18. Characteristics of Waves • Amplitude • Wavelength • Frequency

  19. Amplitude • The maximum distance the molecules of a medium are displace from their rest potential. • Indicates the energy of the wave. • As energy increases, amplitude increases. http://schools.utah.gov/curr/science/core/8thgrd/sciber8/forces/html/WAVENRGY.HTM

  20. Wavelength • The distance between 2 consecutive crests or troughs • Measured in meters or centimeters

  21. Frequency • The number of complete waves, or complete cycles per unit of time. • Measured in Hertz (Hz) http://www.qrg.northwestern.edu/projects/vss/docs/media/Communications/frequency.gif

  22. Website • http://library.thinkquest.org/19537/java/Beats.html • This is a hyperlink, just click on it.

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