Light & Sound

Light & Sound

1. Light

   • Refraction
     • When Light Bends
     • -d to +d = towards the normal
     • +d to -d = away from the normal
   • Reflection
     • Mirrors reflect well because of a smooth, shiny surface
     • Angle I = Angle R
     • Mirror Uses
   • Properties
     • Straight Lines
     • We See things upside-down
     • Shadow = No Light
     • Light is much faster than sound
     • light reflects into our eyes for us to see
   • Colour
     • White Light is not one colour
     • Spectrum = Rainbow
     • Colour Filters
     • Colour objects
     • Absorb

2. Sound

   • Sound
     • Can't travel through a vacuum
     • Something must vibrate
     • Amplitude = Loudness
     • Sound Wave
     • Energy
     • Oscilloscope
     • Big Wave = Loud
     • Frequency = Pitch
     • lots of waves = high frequency = high pitch
     • Frequency = No. of waves per sec
     • High Frequency = More Vibrations
   • Hearing
     • Sound waves make your ear drum vibrate
     • People have different audible ranges
     • Air to Ear Drum to Ear Bones to Hair to Brain
     • Sound gets quitter the further away you are from it.
     • measured in decibels (dB)
     • 20 dB = Needle Drop
     • 40 dB = Kids Playing
     • 60 dB = Road Vehicles
     • 110 dB = Loud Concert
     • 120 dB = Jet Take-off