Properties of Waves (Part 2)
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Transcript of Properties of Waves (Part 2)
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Properties of Waves (Part 2)Textbook Chp 13, pg 255-272
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RecallWhen direction of wave and direction of
vibration is perpendicular to each other, the wave is called a transverse wave
There are two types of waves: 1. Transverse Waves2. Longitudinal Waves
A longitudinal wave is when the wave direction and vibration direction are parallel to each other
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Slinky Demo
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Longitudinal WaveLook at the animated gif belowObserve the direction of the waveObserve the movement of the red particle
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Longitudinal WaveThe wave moves from left to rightThe particle vibrates left and rightThe direction of the wave is parallel to the
direction of vibration of the particlesImportant note: even though the direction is
parallel, the particles DO NOT travel along with the wave. They are still vibrating around fixed position.
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Parts of Longitudinal WavesA transverse wave has crests and troughsA longitudinal wave has compressions and
rarefactionsA wavelength is measured from compression
to compression (or rarefaction to rarefaction)
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Parts of Longitudinal WavesJust like a transverse wave, longitudinal
waves have period, frequency, wavelength, wave speed and they obey the equation v = f λ
Just like in a transverse wave, the amplitude of a longitudinal wave is the largest distance a single particle travels measured from its rest position. It is difficult to see this is a “snap shot” of a longitudinal wave.
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Half-TimeWater Waves in Zero Gravity http://
www.youtube.com/watch?v=zaHLwla2WiI3 kinds of Seismic Waves http
://www.youtube.com/watch?v=T0AEtX-uPLA
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Examples of Transverse & Longitudinal Waves
Transverse Waves Longitudinal WavesElectromagnetic
(EM) Waves (Chp 14)Sound Waves (Chp
15)Surface Water Waves Seismic Waves
(Earthquake waves) Waves on a String Matter waves (not in
syllabus)
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Comparison between Transverse and Longitudinal WavesSimilarities:Both transfer energy without transferring
matter (the particles do not move along with the wave)
Both require vibrationsBoth have amplitude, wavelength, wave
speed, period, frequency and obey the equation v = f λ
Longitudinal waves can also be represented using wavefronts (represent compressions instead of crests)
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Comparison between Transverse and Longitudinal WavesDifferences:
Transverse Waves Longitudinal WavesWave direction is perpendicular to
vibration direction
Wave direction is parallel to vibration
directionCrests and Troughs Compressions and
RarefactionsSurface Water Waves, Waves on a string, EM
Waves
Sound waves, seismic waves
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SummaryLongitudinal Waves are waves direction of
wave is parallel to direction of vibrationsCompressions and RarefactionsExamples of Transverse and Longitudinal
WavesCompare and contrast between transverse
and longitudinal waves
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10 min quiz!Your last one in Sec 3!!!