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Waves Notes Part 1

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Waves Notes Part 1 Wave Disturbance that moves through matter or space. Carry/transfer energy from one place to another. 2 Main Types Electromagnetic Mechanical ... – PowerPoint PPT presentation

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Title: Waves Notes Part 1


1
Waves Notes Part 1
2
Wave
  • Disturbance that moves through matter or space.
  • Carry/transfer energy from one place to another.

3
2 Main Types
  • Electromagnetic
  • Mechanical

4
Electromagnetic
  • Waves that can travel through matter or empty
    space where matter is not present. (also called a
    vacuum)
  • Examples radio waves, microwaves, infrared rays,
    visible light, ultraviolet (UV) rays, and x-rays
    all travel as electromagnetic waves
  • General structure (transverse waves)

5
Mechanical
  • Require the particles of the medium to vibrate in
    order for energy to be transferred.
  • Sound waves, as with all mechanical waves, CANNOT
    be transferred or transmitted through empty space
  • Examples Water waves, earthquake/seismic waves,
    and sound waves
  • Structure transverse OR compressional

6
  • Transverse Wave
  • Waves which vibrate by moving back and forth and
    perpendicular (at right angles) to the direction
    the wave travels are called transverse waves.
    Ex Secondary Waves, Electromagnetic waves
  • Electromagnetic are double transverse waves
    because they are made of electric and magnetic
    fields
  • Pick a single particle and watch its motion.

7
Compressional Waves
  • Compressional waves are mechanical type waves
  • Vibrate by pushing together and moving apart
    parallel to the direction in which the wave
    travels (Aka longitudinal) Ex Primary Waves
    Sound waves
  • Pick a single particle and watch its motion.
  • Particles move from left to right.

8
  • Some waves are both transverse and compressional
  • Water waves and surface waves (seismic ) are
    examples of waves that involve a combination of
    motions.
  • Look at the two particles in blue to show that
    each particle travels in a clockwise circle as
    the wave passes.

9
Transverse Waves
10
Properties of Waves
  • A.) FREQUENCY
  • Waves are measured in hertz.
  • Measure of how many waves pass a point in a
    certain amount of time
  • The higher the frequency Shorter wavelength,
    greater energy carried

Higher Frequency Lower Frequency
11
  • B.) AMPLITUDE
  • Measures of the distance between the middle of a
    wave and a crest or trough
  • For Light the greater amplitude the brighter the
    light.
  • Sound greater amplitude the louder it is
  • The Amplitude of a wave is related to the energy
    which it transports.

Lower Amplitude
Greater Amplitude
12
Properties of Waves
  • C.) WAVELENGTH
  • Measure of distance from crest to crest or trough
    to trough (transverse)
  • A higher frequency causes a shorter wavelength
    and greater energy

13
Compressional
  • Label rarefaction and compression

Rarefaction
Compression
14
Compressional
Transverse
15
Properties of Waves
  • A.) WAVE SPEED
  • The distance a wave travels in an amount of time
  • Wave speed is determined by two things
  • Type of wave
  • Nature of the medium (material)
  • Electromagnetic waves (including light) travel at
    the same speed in empty space (vacuum) which is
    (3 x 108 m/s)
  • Travel slowest in solids/liquids
  • Travel fastest in air/gas

16
B.) Color Filters
  • Write see color notes

17
  • C.) REFLECTION
  • When a surface (mirror or object) that doesnt
    absorb or transmit light.
  • -(Bounces off)
  • -Or sometimes the surface will absorb some light
    and reflect the rest. Examples Banana-reflects
    yellow absorbs all other colors, Leaf-reflects
    green and absorbs all other colors.
  • Light waves reflected off a mirror
  • Sound waves echoes (used by bats and dolphins
    to communicate)

18
Reflection of Waves
19
  • D. REFRACTION
  • When light passes through a different medium and
    bends because it is changing speeds.
  • Examples
  • P-waves entering the Outer Core
  • Rainbows formed as light travels through rain
    drops
  • Pencil looking bent in water
  • Light traveling through a prism

20
Refraction of Waves
DRAW THIS
21
  • E. DIFFRACTION
  • When light bends around an opening
  • Examples
  • Light waves bend under doors or through windows
  • Sound waves bend through open doors and go down
    hallways.

Brain Pop on Refraction and Diffraction
22
Diffraction of Light Waves
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