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1、WavesPhysicsMrs.CoyleCoyle,Greece2005,NorthAegeanSeaWavesandtheircharacteristicsVelocityofawaveTypesofwavesOscillationObjectmovesbackandforthaboutanequilibriumposition.Pulse:Asingledisturbancetravellingthroughamedium.http://www.dacc.edu/~qchen/P102/labs/LAB5.HTMWaveTrain(TravellingWaveorsimpl

2、ywave):Aseriesofpulsesatregularintervals.http://micromachine.stanford.edu/~hopcroft/Research/resonator_images/sin_mov1.gifWaveonaString(Applet)http://phet.colorado.edu/sims/wave-on-a-string/wave-on-a-string_en.htmlGraphofDisplacementvsTimeDisplacementvsDistanceTraveledSpeedofaWave,vv=d/tv=l/Tv=

3、lfTypesofWavesTransverseLongitudinalTransverseTheparticlesvibrateperpendiculartothedirectionofthewave'spropagation(ex:wavesalongastring,electromagneticwaves).Example:SEarthquakeWavehttp://web.ics.purdue.edu/~braile/edumod/waves/Swave_files/image001.gifLongitudinalWavesTheparticledisplacementisp

4、aralleltothedirectionofwavepropagation(ex:sound)TorsionalWavesVideolinkonWeb:CollapseofTakomaNarrowsBridge,WashingtonState,1940http://www.youtube.com/watch?v=shX4Q0QV8VIEllipticalWavesResultwhenlongitudinalandtransversewavesaresuperpositioned.(ex:surfacewaterwaves)OceanWavehttp://www.pa.uky.ed

5、u/~crawford/phy361_sp10/home.htmlOceanWaveNoteWavestransferofenergyfromonepointtoanother.Wavesdonottransfermatter.MechanicalWavesElectromagneticWavesTypesofWavesMechanicalWavesrequireamedium.Examples:Waterwaves( Tsunami)Soundwaves(v=340m/secinairbutvariesfordifferentmedia)EarthquakewavesElectro

6、magneticWavesdonotrequireamediumandcantravelthroughtheemptyspace(vacuum).Example:Lightfromthesuntravelsthroughspaceandreachesus.Note:AllEMwaveshaveaspeedthroughvacuumof3x108m/sec.Problem1Whatisthedistanceasoundwaveinairtraveledin2sec?Answer:680m/sProblem2Whatisthefrequencyofalightwaveofw

7、avelength550x10-9m?Answer:5.5x1014HzProblem3ASONAR(SoundNavigationandRanging)sendsasignaltothebottomoftheocean.Thespeedofsoundinwateris1435m/s.Ifthesignalechoreturnedin0.4sec,howdeepwasthewater?Answer:287m