Waves

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Waves
Page 2611-17-08

• Theyre Not All WET!

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• A wave transfers energy from one place to another
  in oscillations.

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TYPES OF WAVES

• Mechanical waves which require a medium
  (something to travel through)
• Longitudinal waves like sound
• Transverse waves like ocean waves and light
  (light can also be classified as an
  electromagnetic wave were still trying to
  figure out exactly where it goes!)
• Electromagnetic waves travel though space
• Radiation from the Sun produces heat on Earth
• Radio waves are captured by a receiver and
  transformed into mechanical waves

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Types of Mechanical Waves

• Transverse Wave
• the particles of the medium move perpendicular
  to the direction of the wave.

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Transverse Wave
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Parts of a Transverse Wave
Zero or Rest Line
A
B
B
D

• Crest B. Amplitude
• C. Wavelength D. Trough

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Diagram Transverse Wave
Particle Movement
Direction of wave (the Energy)
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Crest

• The highest point of the wave.

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Trough

• The lowest point of the wave.

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Amplitude

• Also known as Wave Height the shortest distance
  from the zero line to the crest.
• The measure of how much energy is in a wave. (How
  loud it is)

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Wavelength

• The shortest distance between two points where
  the wave pattern repeats itself. (Ex. Crest to
  crest)
• The symbol is Lambda

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Examples of Transverse Waves

• Water waves, light, Earthquakes (s-waves are
  absorbed by liquids and travel slowly)
• Remember only solids!

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Longitudinal Wave

• Compression Wave-
• the particles of the medium move parallel to the
  direction of the wave.

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Longitudinal Wave
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Parts of a Longitudinal Wave
A. Wavelength B. Compression C. Rarefraction
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Examples of Longitudinal Wave
Sound Earthquakes (P-waves these go through any
medium and are the fastest Earthquake waves.)
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The measures of a wave

• Period the shortest time interval during which
  the motion repeats itself.
• Symbol for Period

T
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• 2. Frequency The number of complete cycles of
  vibrations or cycles per second. (The longer the
  wavelength, the slower the frequency)

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Frequency
Short Wavelength (short distance) will wave
quickly High Frequency
Long Wavelength (long distance) will wave slowly
LOW Frequency
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The symbol for frequency is f The units
are Hertz (Hz) ( of cycles / second)
LOW FREQUENCY
HIGH
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Speed of a wave
Velocity wavelength x frequency
V f
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Interactive Wave
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Make your own musical instrument!

• First, mash down on one end of the straw to
  make it flat (use your teeth).

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Make your own musical instrument!

• Now, cut the end of the straw to make a point

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Make your own musical instrument!

• Finally, blow on the pointed end to make some
  noise.

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END OF NOTES DAY 1