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Wave Motion

The disturbance (not the particles of the medium) travels.

The direction of the wave compared to the direction of the motion of the vibrating particles determines the type of wave.

Two wave types:

       1. Transverse Waves: vibrate at right angles to the direction of the wave
       2. Longitudinal Waves: vibrate back and forth, parallel to the direction the wave travels

Properties of Light Waves

In a transverse wave:

      High point of a wave --- crests

      Low point of the wave --- troughs

      Wave length --- distance between two successive crests or troughs

      Frequency --- the number of vibrations per second the wave makes

Long wavelengths = low frequencies

Short wavelengths = high frequencies

Velocity --- wavelength x frequency

      Visible Light --- six basic colors (when all colors are seen together appears white)

      Basic Colors --- red, orange, yellow, green, blue, and violet

Each color has a characteristic wavelength and frequency.

      Red --- longest wavelength and the lowest frequency

      Violet --- shortest wavelength and the highest frequency

Polarization of Light

      Unpolarized --- vibrating in all directions

      Polarized --- vibrating in a single path

      Polarizer --- the crystal that produces polarized light

      Polaroid --- artificial material that acts as a polarizer

Uses of polarized light:

      Polarizing lenses --- reduce glare

Used by engineers to locate point of stress in automobiles and machinery

Identify different types of crystals.

Presented By: BW