Waves

1
Waves

• Section 11.1 The Nature of Waves

2
Waves

• Electromagnetic radiation http//www.teachersdoma
  in.org/resources/phy03/sci/phys/energy/emspectrum/
  index.html
• Waves- repeating disturbance or movement that
  transfers energy through matter or space
• Ocean waves, light waves, sound waves
• Energy is transferred from one molecule to a
  neighboring molecule
• http//www.teachersdomain.org/resources/lsps07/sci
  /phys/energy/waves/index.html

3
Waves

• Energy travels in a wave, but the matter stays
  does not move from place to place
• It may move back and forth but end up in about
  the same location
• What to waves carry?
• All waves are produced by vibration
• Up and down motion of your hand holding a rope,
  vibration of a voice box or speaker, etc.

4
Waves

• Medium- the matter through which waves travel
• Can be solid, liquid, gas, or a combination
• Sound travels best in gas
• Ocean waves travel in water
• Not all waves need a medium- example
  electromagnetic waves- light, radio, heat

5
Mechanical Waves

• Mechanical waves- waves that can travel only
  through matter
• Transverse and compressional
• Transverse waves- matter in the medium moves back
  and forth at right angles to the direction that
  the wave travels
• Example ocean waves
• Compressional Waves- matter in the medium moves
  in the same direction that the wave travels
• Examples sound waves, a spring that is squeezed
  and released
• http//www.teachersdomain.org/resources/lsps07/sci
  /phys/energy/waves/index.html

6
Waves

• Combination- not purely transverse or
  compressional water waves, Seismic waves
• Water waves- form due to wind blowing across the
  ocean surface- faster and slower, like a
  vibration http//www.teachersdomain.org/resources/
  ess05/sci/ess/watcyc/wavemotion/index.html
• Size of waves depends on speed, distance, and
  time of wind blowing

7

• Ocean Waves http//www.teachersdomain.org/resourc
  es/kqed07/sci/ess/bigwave/index.html
• Seismic Waves
• http//www.teachersdomain.org/resources/ess05/sci/
  ess/earthsys/seismograph/index.html
• Sound Waves http//www.teachersdomain.org/resourc
  es/hew06/sci/phys/energy/sound/index.html