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