science revision

science revision

1. lesson 1

   • A sound wave is produced by the vibration of particles. Vibration creates areas of compression and rarefaction
     • waves
       • when a sound wave reaches a new medium then it will cause that substance to vibrate slightly
       • ears
         • 1) Pinna helps to 'funnel' sound towards the eardrum which vibrates
           • 2) The vibrations of the eardrum are amplified by the middle ear and carries the vibrations to the inner ear
             • 3) Part of the inner is the cochlea- a spiral shaped structure with tiny hairs inside. these vibrate with the sound and send a signal through the auditory nerve to the brain.
         • waveforms
           • amplitude: This is the vertical distance between the central line and a peak or trough
           • wavelength: This is the horizontal distance between one part of a wave and the same part of the next wave. This is most easily measured from peak to peak or trough to trough