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Transcript of WAVES Essential Questions: What is a wave? How do waves travel? What are the types of waves? ...
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?
Day 1
The Nature of Waves
What are Waves?
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.
How do waves travel?A wave must have MATTER to travel through.
The matter through which a wave travels is called a MEDIUM
Mechanical Waves
Examples of Mechanical Waves:soundairwaterropesearthquakestsunami waves
Mechanical Waves need a medium to travel through.
Mechanical Waves can be either Transverse or Longitudinal
Electromagnetic Waves
Examples of Electromagnetic Waves:x-raysradio wavesinfrared radiationmicrowavesvisible light
Electromagnetic Waves do NOT need a medium to travel through.
Electromagnetic Waves
Electromagnetic Waves are ALWAYS transverse waves.
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
Transverse Wave
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
Longitudinal Waves
Carry energy along the wave
Day 2
Properties of Waves
Properties of Waves:
AmplitudeWave LengthFrequencyWave Speed
Amplitude wave height larger amplitude = more energy
Wavelength distance between 2 crests or troughs shorter wave length = more energy
Frequency (Hertz / Hz) the number of waves produced in a given
amount of time higher frequency = more energy
Wave Speed speed at which waves travel through a
medium
Properties of a wave
Day 3
WAVE INTERACTIONS
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.
RefractionRefraction – is the bending of a wave as the wave passes from one medium to another at an angle.
DiffractionThe bending of waves around a barrier or through an opening is known as diffraction.
InterferenceInterference happens when waves overlap
Constructive: amplitude increases
Destructive: amplitude decreases
ResonanceResonance – vibration produced in one object that is caused by the vibration produced in another
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
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