IB DP Physics: SL复习笔记4.3.1 Wavefronts


  • Waves can be represented graphically in two different ways:
    • Wavefronts - lines joining all the points that oscillate in phase and are perpendicular to the direction of motion (and energy transfer)
    • Rays - lines showing the direction of motion (and energy transfer) of the wave that are perpendicular to the wavefront


Wavefronts and rays for transverse waves travelling in a horizontal plane

  • The distance between successive wavefronts is equal to the wavelength of the waves
  • Ripple tanks are used a common experiment to demonstrate diffraction of water waves

Wave effects may all be demonstrated using a ripple tank

  • The diagram below shows how the wavelengths differ with frequency in a ripple tank
    • The higher the frequency, the shorter the wavelength
    • The lower the frequency, the longer the wavelength

Ripple tank patterns for low and high frequency vibration