what are waves?
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What are waves?
MT 6 LT 1
Background Knowledge: Waves
What are some examples of waves?
Why are waves important?
What causes waves?Waves are created when a source of Energy causes a medium to vibrate.
WAVES NEED ENERGY TO MOVE
A vibration is a repeated back and forth or up and down motion.
What are the different types of Wave?
Mechanical WavesSound WavesElectromagnetic Waves
This LT will focus on Mechanical Waves
What are mechanical waves?
Definition: A disturbance that transfers energy from place to place.
They need a source of energy to produce it
How are waves & energy related?
A wave transports energy along a Medium without transporting matter.
Mediums & WavesWhat do mechanical waves move through?
A mediumMechanical waves require a medium in order to travel from one place to anotherCan be gas, liquid, or solid.
Waves in different mediums travel at different speeds.
Mediums & WavesWhat do mechanical waves move through?
Mechanical Waves do NOT move the medium from one place to another
Note that Not all waves require a medium to travel.
Example: Light from the sun travels through empty space.
What determines the speed of a Mechanical
Wave?
The speed of a wave is determined by its:
Wavelength x Frequency
What are the different types of Mechanical
Waves?
What are the different types of Mechanical
Waves?Waves are classified according to how they move.3 types of Waves:
Transverse WaveLongitudinal WaveSurface Wave
What is a Transverse Wave?
A wave that travels in the opposite direction (perpendicular) to the medium in which it is traveling through
Transverse means across.
Basic Properties of Transverse Waves (What are the parts of
a Transverse Wave?)
CrestTroughAmplitude
EnergyWavelength
Basic Properties of Transverse Waves (What are the parts of
a Transverse Wave?)
CrestThe highest point of the wave above the rest position
TroughThe lowest point below the rest position
Transverse Wave: Amplitude
Amplitude is the distance from the rest to crest or rest to trough.
The farther a medium moves as it vibrates, the larger the amplitude.
Rest
Transverse Wave: Amplitude
The Amplitude tells us the amount of energy being transported.
High Energy = High AmplitudeLow Energy = Low Amplitude.
Transverse: WavelengthA wave travels a certain distance before it repeats. When it repeats, it is knows as the WavelengthThe wavelength is the distance between 2 corresponding (same/related) parts of a wave .
Measured from crest to crest or trough to trough.
Wave HeightThe distance from one crest to one trough (trough to crest too)
Draw a Transverse Wave and label: crest & trough
Longitudinal WaveThe vibration of the medium is the same direction (parallel) to the direction in which the wave travels.
Example: Slinky
Longitudinal WaveCompressions:
The parts where the coils are close together
Rarefactionsthe parts where the coils are spread out
What is a Surface Wave?
Surface WavesA wave that travels along a surface separating two media
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