3.3 state the meaning of amplitude, frequency , wavelength and period of a wave


  • Crest – highest point of a wave
  • Trough – lowest point of a wave
  • Wavelength – shortest distance between a point on one wabr and the same point on the other wave, eg. 2 successive troughs or two successive crests
  • Amplitude – the maximum displacement from equilibrium. Height from the trough/crest measured from the rest position (equilibrium). (the ‘loudness’ of the wave)
  • Frequency (Hz) – Number of complete waves produced in a second – the higher the frequency, the higher the pitch of sound
  • Period – time taken for one point of the wave to complete an oscillation (time taken to produce a complete wave). Measured in seconds

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