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2.  Waves (Def.) – a disturbance that carries energy but not matter from one place to another  Medium – Substance or region through which a wave is transmitted.  Speed of Waves – Depends on the properties of the medium.

3.  Transverse Waves › Energy travels perpendicular (at a right angle) to the direction of motion › Carries energy from one point to another › Has wavelength, crest, trough, and amplitude › Example: light waves  Longitudinal (Compression) Waves › Energy travels parallel to (in the same direction as) the direction of motion › Carries energy from one point to another › Has wavelength and regions of compression and rarefaction › Example: sound waves

5. Compression

6.  Transverse Waves › Distance from one crest to the next crest on a wave › Can also be measured from one trough to the next trough  Longitudinal (Compression) Waves › Distance between maximum compressions

7.  Half the difference in height between the crest and the trough of a wave

8.  high point of a wave  low point of a wave

9.  Region in which the waves are packed closely together  Wavelengths are shorter  Region of waves that are less closely packed together  Longer wavelength Compression

12.  Waves that occur when the medium is fixed at both ends  Occurs as both transverse or compression waves

14.  Bouncing back of light waves › Regular—mirrors smooth surfaces scatter light very little. Images are clear & exact. › Diffuse reflection – reflected light is scattered due to an irregular surface.

16.  Refraction – Bending of light due to a change in speed. › Index of Refraction – Amount by which a material refracts light. › Prisms – Glass that bends light. Different frequencies are bent different amounts & light is broken out into different colors.

18.  mutual action of two waves of the same frequency reinforcing or neutralizing each other

19.  series of colored bands diffracted and arranged in order of wavelengths

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21.  Visible Spectrum – Light we can see › Roy G. Biv – Acronym for Red, Orange, Yellow, Green, Blue, Indigo, & Violet. › Largest to Smallest Wavelength.

22.  Invisible Spectrum › Radio Waves  Longest wavelength & lowest frequency.  Uses – Radio & T.V. broadcasting. © 2000 Microsoft Clip Gallery