Waves

• When waves travel from one medium to another their speed and wavelength change but frequency stays the same
• Speed and wavelength are directly proportuonal
• Waves can be reflected, refracted, absorbed and transmitted at the boundary between one medium and another
• The angle of incidence is the angle between the incoming light ray and the normal
• Matte black absorbs the most light
• A lens forms and image by refracting light
• Concave lens

  • wider at edges
  • diverging lens
• Convex lens

  • wider in the middle
  • Converging lens
• Our ears detect vibrations and transfer information to our brains via our auditory nerve
• Sound waves are longitudinal
• Ultrasound uses

  • medicine
  • industry
  • measure water depth
  • dog training