Properties of a Wave -

  • Amplitude-the maximum extent of a vibration or oscillation, measured from the position of equilibrium.
  • Wavelength-the distance between successive crests of a wave, especially points in a sound wave or electromagnetic wave.
  • Period- A Time period is the time needed for one complete cycle of vibration to pass a given point. As the frequency of a wave increases, the time period of the wave decreases.
  • Frequency-the number of crests of a wave that move past a given point in a given unit of time. The most common unit of frequency is the hertz (Hz), corresponding to one crest per second.

Simple Harmonic Motion

  • Simple harmonic motion-oscillatory motion under a retarding force proportional to the amount of displacement from an equilibrium position.
  • If a spring is sprung and is attached to a wall it will not stop moving back and forth if no other force is acted upon it.
  • This constant back and for the motion is simple harmonic motion

Tacoma Bridge and Resonance

  • Resonance- the reinforcement or prolongation of sound by reflection from a surface or by the synchronous vibration of a neighboring object.
  • Tacoma Bridge was a bridge that fell shortly after is was built due to the resonance of the wind.
  • It fell because the wind matchee the bridges resonant frequency and the contestant resonance caused it to collapse

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