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Introduction to Unit 3

Wednesday, 23 January 2008. What's in Unit 3. Wave EquationsTravelling wavesStanding wavesResonanceDoppler EffectMoving sourceMoving observerInterference by Division of AmplitudePhase

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Introduction to Unit 3

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    1. Wednesday, 23 January 2008 Introduction to Unit 3

    2. Wednesday, 23 January 2008 What’s in Unit 3 Wave Equations Travelling waves Standing waves Resonance Doppler Effect Moving source Moving observer Interference by Division of Amplitude Phase & reflection Lens coatings & films Thin air wedges Interference by Division of Wavefront Young’s Slits Polarisation Brewster’s Angle Malus’s Laws

    3. Wednesday, 23 January 2008 Wave Revision These things you should know about from higher and SG The wave equation (v=f?) Path difference and interference Period, frequency, amplitude & wavelength Transverse & longitudinal waves

    4. Wednesday, 23 January 2008 So try these…. Calculate the wavelength of light with a frequency of 5.6x1014Hz. Calculate the wavelength of sound in air at the upper frequency limit of human hearing. Explain the meaning of the terms “in phase” and “out of phase”. Explain the meaning of “transverse” and “longitudinal” waves. Two loudspeakers are 1m apart producing coherent sound. A student is in a position she determines to be the second maximum of interference and measures the distances to the speakers as 5.4m and 6.8m respectively. Calculate the wavelength and hence the frequency of the sound being produced.

    5. Wednesday, 23 January 2008 Waves – A Math Analysis In AH physics we limit analysis to relatively simple sine and cosine waves which have the general formula: If we imagine a wave travelling along a rope, this equation gives us the vertical position of the starting point of the wave as it varies with time. More generally we can say that the vertical displacement of any point on the rope ’x’ metres from the start after time ‘t’ is:

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