Properties of Mechanical Waves.ppt

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Properties of Mechanical Waves.ppt Powered By Docstoc
					Properties of Mechanical
         Waves
       Section 17.2
      Frequency and Period
• Periodic motion- any motion that repeats at
  a regular interval




• Waves have periodic motion
     Frequency and Period
• Period- time of one cycle (motion to
  return to start)
  – Units: seconds (s)
     Frequency and Period
• Frequency- number of cycles per
  second
  – Units: hertz (Hz) = /s or s-1
             Wavelength
• Wavelength- distance between a point
  on one wave and the same point on
  the cycle of the next wave
  – For longitudinal waves, it is the distance
    between compressions
             Wavelength
• Wavelength- distance between a point
  on one wave and the same point on
  the cycle of the next wave
  – For transverse waves, it is the distance
    between adjacent crests or troughts
          Wave Speed


• Speed: m/s
• Wavelength: m
• Frequency: Hz
             Amplitude
• Amplitude- the maximum
  displacement of the medium from its
  rest position
  – aka “height”
  – The more energy a wave has, the greater
    its amplitude
       Reviewing Concepts
1. How is wavelength related to frequency if
   the wave is traveling at a constant speed?
2. How is energy related to the amplitude of
   a wave?
3. Describe two ways to measure the
   wavelength of wave.
4. If you double the frequency of a wave,
   what will happen to its wavelength if the
   speed does not change?

				
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