Waves

Waves

1. Sound

   • Longitudinal Waves
     • Longitudinal waves are compression waves. Air particles move closer and further apart.
   • Require Particles
     • Sound waves require partilces to travel through. Sound cannot travel through space because there are no air particles.
     • Sound will travel faster and further if the particles are closer together. So sound travels a long way in water compare to air.

2. Light

   • Transverse waves
     • Transverse waves are electromagnetic waves that can travel through space. A clear line of sight is required for light waves to be visible (they are blocked by opaque objects).
   • Reflection
     • Light reflects off all objects.
     • Straight Mirrors
       • Light reflects perfectly back from straight mirrors but objects are reversed.
     • Concave Mirrors
       • Concave mirrors have the focal point in front of the mirror. Objects will look bigger.
         • E.g. shaving mirrors
     • Convex mirrors
       • Convex mirrors will have a focal point "inside" the mirror. Objects will look smaller.
         • E.g. Wide mirrors to see around corners
   • Refraction
     • Convex Lens
     • Light bends when it moves through one medium into another
     • Concave Lens
       • Concave lenses

3. Electromagnetic Spectrum

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