waves essential questions: what is a wave? how do waves travel? what are the types of waves? ...
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WAVESEssential Questions:
What is a wave? How do waves travel? What are the types of
waves? What are the properties
of waves? What are 4 types of
wave interactions?
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Day 1
The Nature of Waves
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What are Waves?
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What is a WAVE? A wave is any disturbance that
transfers energy through matter.
Waves only carry energy, not matter! Once the wave has moved, the
disturbance is gone.
The energy carried by ocean wavescan break rocks.
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How do waves travel?A wave must have MATTER to travel through.
The matter through which a wave travels is called a MEDIUM
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Mechanical Waves
Examples of Mechanical Waves:soundairwaterropesearthquakestsunami waves
Mechanical Waves need a medium to travel through.
Mechanical Waves can be either Transverse or Longitudinal
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Electromagnetic Waves
Examples of Electromagnetic Waves:x-raysradio wavesinfrared radiationmicrowavesvisible light
Electromagnetic Waves do NOT need a medium to travel through.
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Electromagnetic Waves
Electromagnetic Waves are ALWAYS transverse waves.
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Transverse Waves
waves in which the particles vibrate in an up and down motion
ex: light waves
http://www.youtube.com/watch?v=UHcse1jJAto&feature=player_detailpage#t=8
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Transverse Wave
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Longitudinal Waveswaves in which the particles vibrate back and forth along the path that the wave moves.
ex: sound waves
http://www.youtube.com/watch?v=aguCWnbRETU&feature=player_embedded
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Longitudinal Waves
Carry energy along the wave
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Day 2
Properties of Waves
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Properties of Waves:
AmplitudeWave LengthFrequencyWave Speed
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Amplitude wave height larger amplitude = more energy
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Wavelength distance between 2 crests or troughs shorter wave length = more energy
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Frequency (Hertz / Hz) the number of waves produced in a given
amount of time higher frequency = more energy
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Wave Speed speed at which waves travel through a
medium
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Properties of a wave
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Day 3
WAVE INTERACTIONS
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Reflection Waves reflect after hitting a barrier. all waves can be reflected. a wave can also be transmitted through a
substance.
Reflection – happens when a wave bounces back after hitting a barrier.
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RefractionRefraction – is the bending of a wave as the wave passes from one medium to another at an angle.
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DiffractionThe bending of waves around a barrier or through an opening is known as diffraction.
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InterferenceInterference happens when waves overlap
Constructive: amplitude increases
Destructive: amplitude decreases
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ResonanceResonance – vibration produced in one object that is caused by the vibration produced in another
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properties
• _________• _________• _________• _________
can undergo
• ________• reflection• ________• interferen
ce
types
are always
can be either
do _____need a __________
need a __________
examples
examples
• x-rays• radio
waves• infrared
radiation• microwav
es• visible
light
• sound• air• water• ropes• earthquake
s• tsunami
waves
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properties
• amplitude• wave
length• frequency• wave
speed
can undergo
• refraction• reflection• diffractio
n• interferen
ce
types
Electromagnetic Waves
Mechanical Waves
are always
can be either
do NOT need a medium
need a medium
Transverse
Longitudinal
examples
examples
• x-rays• radio
waves• infrared
radiation• microwav
es• visible
light
• sound• air• water• ropes• earthquake
s• tsunami
waves