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AS Physics - Waves
 

AS Physics - Waves

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AS physics - AQA spec - waves - part of UNIT 2 [UK]

AS physics - AQA spec - waves - part of UNIT 2 [UK]

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    AS Physics - Waves AS Physics - Waves Presentation Transcript

    • Waves
    • Waves Terms
      Peak
      Trough
      Displacement – Distance and direction from equilibrium position
      Amplitude – Maximum displacement of vibrating particle from equilibrium position
    • Wavelength – The least distance between 2 adjacent vibrating particles ie. 2 peaks or troughs
      Wave cycle - From one maximum displacement to the next maximum displacement
      Wave Period – Time for one wave to pass a fixed point
      Frequency – Number of complete waves passing a point each second. (Hz)
      C = fλ
    • Longitudinal & Transverse Waves
      Particle vibration in Longitudinal waves are parallel to the direction the wave travels
      Longitudinal waves include sound and primary seismic waves
      Particle vibration in Transverse waves are perpendicularto the direction the wave travels
      Transverse waves include Electromagnetic and secondary seismic waves
    • Polarisation
      Plane- Polarised transverse waves stay on 1 plane only
      Un-polarised transverse waves move from one plane to another
      Longitudinal waves cannot be polarised
    • Stationary Waves - Definition
      These are waves where the positions of the peaks and troughs do not move
      You can observe standing waves by fixing one end of a piece of rope to a stationary object and oscillating it like a sin wave
      When the wave reaches the fixed when it 'reflects' back towards you
      When this occurs fast enough you'll start to see standing wave patterns like the diagram below
    • Nodes and antinodes
      In the context os standing waves, a node is a point where the amplitude is zero
      An antinode is the opposite: a point where the amplitude is at its maximum:
    • Wave Diffraction
      Diffraction is the spreading out of waves as they pass through a gap or by an obstacle