GCSE›Edexcel GCSE Physics›Mind mapsProperties of WavesEdexcel GCSE Physics: Mind mapStudy pack PDFAlso for this subtopic:Revision notesFlashcardsSubtopic testCover factsWhat waves doTransfer energy and informationDo not transfer matterCork bobs up and down on ripplesAir particles vibrate to pass on soundWave quantitiesFrequency: waves per second, in HzWavelength: distance between identical pointsAmplitude: maximum displacement from restPeriod: time for one waveWavefront joins points in phaseTwo typesTransverse: vibrates at right anglesLight, water and S-waves are transverseLongitudinal: vibrates parallelSound and P-waves are longitudinalCompressions and rarefactionsWavesproperties of wavesHzmsv=fλv = f\lambdav=fλWave speedv=fλv = f\lambdav=fλv=xtv = \frac{x}{t}v=tx50 Hz, 2 m gives 100 m/sSound: time flash to bang, then averageEcho: x=vtx = vtx=vt for down and backAt a boundaryReflected, transmitted or absorbedRefracted: direction changes as speed changesAbsorbed energy often becomes heatBehaviour depends on wavelengthExam tipsWrite the equation first for a markSeismic waves come as both types