Measurements of waves: Transverse waves: Compression waves: compressionrarefaction.

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Presentation transcript:

Measurements of waves: Transverse waves: Compression waves: compressionrarefaction

Measurements of waves: Shortest distance between points where the wave pattern repeats itself (usually measured from crest to crest)  wavelength symbol  (lambda) units  meters m

Measurements of waves: number of wave crests passing a fixed position in 1 second  frequency symbol   units  wave crests per second  Hertz (Hz)

Measurements of waves: the time for two successive crests to pass a fixed point  period symbol  T units  seconds frequency and period are inverses of each other:  = 1/T T = 1/

Measurements of waves: the maximum displacement from equilibrium position  amplitude is a measure of the amount of energy transferred by the wave more energy transferred  more amplitude symbol  A units  depends on type of wave (sound: decibel, light: lumen, etc.)

Measurements of waves: v = ? v =  velocity  for a specific type of wave in a specific medium, velocity remains constant (regardless of changes in frequency, period, amplitude, or wavelength)

Measurements of waves: v =  velocity  when a wave changes medium, the velocity changes: into more dense  velocity increase into less dense  velocity decrease

Measurements of waves: v =  velocity  when a wave changes medium, the wavelength also changes as well: into more dense  wavelength increase into less dense  wavelength decrease ://

Measurements of waves: v =  velocity  so, when a wave changes medium, the frequency remains constant.

Example Situations: 1)Water waves on a lake are 10.0cm long and pass the post of a pier at 5.6 crests per second. a) what is the velocity of these waves? b) what is the period of the waves? 2) The speed of sound in water is 1498m/s. If you start singing the note middle-C ( = 262Hz) just below the water surface, what will the wavelength of your sound wave be?