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  • 7.1GeneralWaveProperties1.notebook

    1

    November11,2015

    7.1GeneralWaveProperties

    Whatisawave?

    Awaveisanoscillationthatmovesthroughspace,transferringenergyfromoneplacetoanother.

    Wave1.mp4

    Water(themedium)ismovedupanddown,butisnotmovedinthedirectionofthewave.

    Whichoftheseisnotanexampleofawave?

    Alltruewavesmoveorpropagatethroughspace,thereforetheripplesonasanddunearenotwaves.

  • 7.1GeneralWaveProperties1.notebook

    2

    November11,2015

    7.1GeneralWaveProperties

    Vibration Awaveisaperiodicdisturbanceinamaterial(medium)orspace.

    Eachparticleofthemediumvibrates,oroscillates,aboutafixedposition.Energyistransferredoutwardsfromthesourceofthewave.

    Wavesthatmoveoutwardsfromtheirsourcearecalledtravellingwaves.Thetwotypesofprogressivewavearetransverseandlongitudinal.

  • 7.1GeneralWaveProperties1.notebook

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    November11,2015

    7.1GeneralWavePropertiesWaveCharacteristics

    Period

    Amplitude

    A

    Wavelength

    WavelengthThedistancebetween2consecutivepointsinphase

    FrequencyThenumberofcyclesofthewavepersecond.Thebiggerthe

    frequencythehigherthepitchofthenoteorthebluerthelight

    AmplitudeThemaximumdistancethatanypointonthewavemovesfrom

    itsmeanposition.Thebiggertheamplitudethelouderthesound,therougherthesea,orthebrighterthelight

    Period(T)Thetimeittakesforonecompletecycleofthewave.

    Displacement(x)Howfartheparticlehastravelledfromitsmeanposition.

    Wavespeed(v)Thespeedatwhichthewavefrontspassastationaryobserver

    Frequencyf=1/T

  • 7.1GeneralWaveProperties1.notebook

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    November11,2015

    Wavesintimeandspace7.1GeneralWaveProperties

    Thesetwowaveformslookthesame,buttheyeachgivedifferentinformationaboutthewavetheyrepresent.

    Thisgraphrepresentshowychangeswithtime.Itcouldbeanoscillationofvoltage,displacement,pressure,oranyothersuitablevariable,dependingonthecontext.

    Thisgraphrepresentshowychangesalonganaxisxinspace.Itcouldbeawaveofdisplacementorpressure,oranyothersuitablevariable,dependingonthecontext.

  • 7.1GeneralWaveProperties1.notebook

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    November11,2015

    7.1GeneralWavePropertiesTheSpeedofaWaveThesewavesaretravellingacrossthesurfaceofapond.Thelengthofeachwaveis0.25m.

    Twowavespasstheduckeachsecond,sothefrequencyis2Hz.

    Thismeansthatthewavestravel0.5meachsecond,sothespeedofthewavesis0.5m/s.

    speed=frequencywavelength0.5m/s=2Hz 0.25m

    v=f

  • 7.1GeneralWaveProperties1.notebook

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    November11,2015

    7.1GeneralWavePropertiesElectromagnetic(EM)WavesElectromagneticwavestravelat300,000,000m/s(3x108m/s)throughavacuum.Thisvalueisapproximatelytheirspeedthroughair.

    Atypicalradiostationmaybroadcastatafrequencyof98MHz.Calculatethewavelengthofthisradiowave.

  • 7.1GeneralWaveProperties1.notebook

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    November11,2015

    Transversevs.longitudinalwaves

    7.1GeneralWaveProperties

    Transversewavesarewhenthedisplacementisatrightanglestothedirectionofthewave

    Longitudinalwavesarewhenthedisplacementisparalleltothedirectionofthewave

  • 7.1GeneralWaveProperties1.notebook

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    November11,2015

    7.1GeneralWaveProperties

    Waveswillalwaysreflectinsuchawaythattheangleatwhichtheyapproachabarrierequalstheangleatwhichtheyreflectoffthebarrier.

    LawofReflection

    LawofRefraction

    Refractionisaccompaniedbyachangeinspeedandwavelengthofthewaves.

    Diffraction

    Diffractionisthespreadingoutofawave.

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    November11,2015

    7.1GeneralWaveProperties

    Homework

    Page125#1HandoutQuestionsPage127#1&2

  • Attachments

    Wave1.mp4

    SMART Notebook

    Page 1: Nov 10-14:43Page 2: Nov 10-15:11Page 3: Nov 10-15:22Page 4: Nov 10-15:38Page 5: Nov 10-15:46Page 6: Nov 11-08:14Page 7: Nov 11-08:22Page 8: Nov 11-08:36Page 9: Nov 11-08:42Attachments Page 1

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