WaveIntroduction

WaveIntroduction

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What’s a Wave? What’s a Wave?

• A transfer of energy through a repetitive pattern of some sort

• Most waves involve the repetitive motion of particles (Matter)…

• …light is the exception.

• A transfer of energy through a repetitive pattern of some sort

• Most waves involve the repetitive motion of particles (Matter)…

• …light is the exception.

Mechanical WavesMechanical Waves• Transverse

• Wave particles move perpendicular to wave motion

• http://www.youtube.com/watch?v=UHcse1jJAto

• Compressional / Longitudinal

• Wave particles move parallel to wave motion

• http://www.youtube.com/watch?v=Rbuhdo0AZDU

• Transverse

• Wave particles move perpendicular to wave motion

• http://www.youtube.com/watch?v=UHcse1jJAto

• Compressional / Longitudinal

• Wave particles move parallel to wave motion

• http://www.youtube.com/watch?v=Rbuhdo0AZDU

Transverse WavesTransverse Waves• Light

• Stringed Instruments

• Water

• Sports

• Earthquake Secondary S-Wave

• Light

• Stringed Instruments

• Water

• Sports

• Earthquake Secondary S-Wave

Longitudinal WavesLongitudinal Waves• Sound

• Earthquake Primary P-Wave

• Sound

• Earthquake Primary P-Wave

FrequencyFrequency

• The number of wavelengths that pass a fixed point each second

• Measured in Hertz (Hz)

PeriodPeriod

• The amount of time it takes one wavelength to pass a point

• Measured in Seconds

RelationshipRelationship

Frequency Increases

Wavelength Decreases

Transverse Wave Parts

Transverse Wave Parts•Wavelength Wavelength ((λλ))

• Distance from point to Distance from point to next repeating point on next repeating point on wavewave

•CrestCrest• Part of wave above Part of wave above

equilibrium positionequilibrium position

•TroughTrough• Part of wave below Part of wave below

equilibrium position equilibrium position

•AmplitudeAmplitude• Distance fr. equilibrium to Distance fr. equilibrium to

max. or min. positionmax. or min. position

Longitudinal Wave Parts

Longitudinal Wave Parts•Wavelength Wavelength ((λλ))

• Distance from pt. to Distance from pt. to next repeating pt.next repeating pt.

•CompressionCompression• Part of wave where Part of wave where

particles are closeparticles are close

•RarefactionRarefaction• Part of wave where Part of wave where

particles are far apart particles are far apart

Wave SpeedWave Speed

AmplitudeAmplitude

• Energy carried by a wave

The greater the Amplitude

The more Energy the wave carries

• Compressional– based on how close coils are

• Transverse– based on height of wave

What type of wave is this?

What type of wave is this?