through a medium air by HC120912092649

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									Waves
    Fundamentals of Wave Mechanics
• Waves are disturbances through a medium (air, water, empty
  vacuum), that usually transfer energy.

•    Here is a graph of motion for a medium carrying a wave:
   Determining Wave Velocity
• The distance between each “bump” is
  called a wavelength (λ), and the number of
  bumps per second is called the frequency
  (f). The velocity at which the wave crest
  moves is jointly proportional to λ and f:
           V=λf
Superimposition (aka Interference)
       Speed of Sound in Air
• Example 1: The speed of sound in air is
  ~343 m/s. What is the distance between
  the regions of maximum compression of
  air for a sound wave with a frequency of
  220Hz?
• Example 2: What happens to the
  wavelength if the frequency is increased to
  440Hz? Why?
Supersonic
Hypersonic

								
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