Physics topic 4

  • Created by: molly
  • Created on: 01-04-18 21:31
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  • Physics-T4
    • Waves
      • Longitudinal waves: A wave where the vibrations are parallel to the direction in wich the wave is travelling. E.g sound waves and seismic P waves
      • Transverse waves: A wave where the vibrations are at a right angle in wich the wave is travelling. E.g water, electromagentic
      • describing waves
        • Frequency: number of waves passing a point each second (Hz)
        • Speed: the speed (m/s)
        • period: length of time it takes one wave to pass a given point
        • wavelength: distance from one point on a wave to the same point on the next wave (M)
        • Amplitude: maximum point on a wave from its resting position (M)
        • Velocity: speed in the direction its travelling
    • Wave equations (on flash cards)
    • Refraction
      • refraction can result in a change in direction when a wave enters a different medium
    • Waves crossing boudries
      • when wave reach an interface they can be:
        • reflected - bounces off
        • Refracted - the wave passes into a new material but changes direction
        • Transmitted - wave passes through the material
        • Absorbed - the wave disappears as the energy it is carrying is transferred into the material
    • Ears and Hearing
      • see notes
    • Ultrasound
      • higher than 20000 Hz
    • Infrasound
      • Lower than 20 Hz
      • Longitudinal P waves
      • Transverse S waves


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