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					Mechanical vs. Electromagnetic
           Waves
           Mechanical Waves
• Waves that require a
  material medium
• Examples include water,
  sound, and waves along a
  spring or rope
• These materials carry the
  energy of the wave
        Electromagnetic Waves
• Waves that DO NOT require a medium for
  motion
• Examples include light waves, radio waves,
  and X-rays
• All electromagnetic waves travel through
  space at the speed of light
• Since these waves can’t be observed, we
  study mechanical waves
Electromagnetic Waves
                           Transverse
                             Waves

          Mechanical      Longitudinal
           Waves            Waves
Waves
        Electromagnetic
                          Surface Waves
             Waves
           Transverse Waves
• Particles of medium vibrate perpendicular to
  the direction of the motion of the wave
• Examples include guitar strings, waves in
  piano strings
          Longitudinal Wave
• Particles of medium to move parallel to the
  direction of the wave
• Examples include sound waves, waves through
  fluids, liquids, gases or plasma
              Surface Waves
• Mixture of transverse
  and longitudinal
  waves
• Example: At the
  surface of the water,
  particles move
  parallel and
  perpendicular to the
  direction of the wave.
Earthworm Examination


• Grab an earthworm from the vermicompost.
  Study the movement and decide whether an
  earthworm moves by longitudinal, transverse,
  or surface waves...
       Types of Waves

• Using materials around the
  classroom, set up a
  demonstration showing a:
  – Transverse Wave
  – Longitudinal Wave
  – Surface Wave

				
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posted:3/25/2013
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