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    2.6 student 2.6 student Presentation Transcript

    • What is a wave? November 23, 2010 How many types of wave have you heard of in everyday use? Do they have anything in common?
    • Aims
      • Describe the origin of a wave
      • Explain the properties of a wave
    • Key terms
      • Displacement :
      • Oscillation :
    • What is a wave?
    • What causes a wave?
      • The source of a wave is always something that vibrates
      • The material that the wave travels through is called the medium
    •  
    • Amplitude, A
      • The maximum distance that each point in the medium moves from its normal position as the wave passes
      • This is the number of waves that pass any point in the medium every second, so it is the same as the number of vibrations per second
      • This is the speed at which each wave crest moves through the medium.
      • Measured in metres per second, m/s or ms -1
    • Wavelength, λ
      • This is the length of a complete wave measured from any point to the next identical point – the distance is always the same no matter which point you choose
    • Where: v = speed of wave / m/s f = frequency of wave / Hz (1/s) λ = wavelength of wave / m
    • How can we prove this? What would happen if we increased the wavelength of a wave? What would happen if we decreased the wavelength of a wave?