1.1 waves

• 1. Chapter 1: WAVES www.myfunphysicsworld.blogspot.com

2. WAVES1.1 Waves1.2 Reflection of waves1.3 Refraction of waves1.4 Diffraction of waves1.5 Interference of waves1.6 Sound waves1.7 Electromagnetic waveswww.myfunphysicsworld.blogspot.com 3. Learning outcomes 1 By the end of this lesson you should able to:Describe what is meant by wave motionRecognize that waves transfer energy without transferring matterCompare transverse and longitudinal waves and give examples of eachstate what is meant by wavefront.State the direction of propagation of waves in relation to wavefronts. www.myfunphysicsworld.blogspot.com 4. Throw a stone in a pool, what can you see? Ripple spread out in an expanding circlewww.myfunphysicsworld.blogspot.com 5. Wave motionOscillating or vibratingmotion in which a pointor body moves back andforth along a line about afixed central pointwww.myfunphysicsworld.blogspot.com 6. Oscillating/Vibrating System Oscillating/Vibrating system = Source Produces waves www.myfunphysicsworld.blogspot.com 7. WavesWaves transfer energyfrom 1 point to anotherWithout transferringmatter www.myfunphysicsworld.blogspot.com 8. Matter ReceiverSourcewww.myfunphysicsworld.blogspot.com 9. Trail of destruction in Penangwww.myfunphysicsworld.blogspot.com 10. www.myfunphysicsworld.blogspot.comwaves transverse longitudinalThe vibration of The vibration of thethe medium ismedium isperpendicularparallelto the direction ofto the direction ofpropagation of the propagation of thewave wave Electromagnetic wave Sound wave 11. Transverse Wavewww.myfunphysicsworld.blogspot.com 12. Longitudinal 13. crest troughLines joining all the points of the samephase : wavefrontwww.myfunphysicsworld.blogspot.com 14. Wavefronts are perpendicular to the direction ofpropagation of wavewww.myfunphysicsworld.blogspot.com 15. Learning outcomes 2By the end of this subtopic you should able to: Define amplitude, period, frequency, wavelength andspeed of wave. Sketch and interpret a displacement-time graph for awave. Sketch and interpret a displacement-distance graphfor a wave Clarify the relationship between speed, wavelength,and frequency. Describe damping in an oscillating system Describe resonance in an oscillating systemwww.myfunphysicsworld.blogspot.com 16. Terms to describe wave: Unit?1. Wavelength Distance between 2 adjacent points of the same phase* on a wave *trough & trough//crest & crest// *compression & compression//rarefaction & rarefactionwww.myfunphysicsworld.blogspot.com 17. crest troughLines joining all the points of the samephase : wavefrontwww.myfunphysicsworld.blogspot.com 18. Wave form, showing wavelength & amplitudewww.myfunphysicsworld.blogspot.com 19. www.myfunphysicsworld.blogspot.com 20. Terms to describe wave: Unit?2. Amplitude (a or A)maximum displacement from its equilibrium positionwww.myfunphysicsworld.blogspot.com 21. Swing of simple pendulumRelate displacement & amplitudewww.myfunphysicsworld.blogspot.com 22. 3. Period Time taken for one complete oscillation of a wavewww.myfunphysicsworld.blogspot.com 23. www.myfunphysicsworld.blogspot.com 24. www.myfunphysicsworld.blogspot.com 25. 4. Frequency (f) The number of complete oscillation in one unit time f = 1/T T = period Frequency, f = Velocity, vWavelength, f=v/ www.myfunphysicsworld.blogspot.com 26. www.myfunphysicsworld.blogspot.com 27. 5. Wave speed The measurement of how fast a crest is moving from a fixed point v = f www.myfunphysicsworld.blogspot.com 28. 1. Displacement-time Graph (of a particle on a wave) Period >> time between 2 consecutive point in phase in a graphAmplitudeT = PeriodFrequency? Wavelength? 29. 2. Displacement-distance Graph(of a particle on a wave) www.myfunphysicsworld.blogspot.com 30. Damping in an oscillating systemAmplitude decreasesPeriod & frequency constantwww.myfunphysicsworld.blogspot.com 31. ResonanceResonance is a phenomenon where asystem vibrates with maximum amplitudewhen the external frequency is the sameas natural frequency.External factors frequency //forcedfrequencynatural frequency: Every object has itsown frequency :www.myfunphysicsworld.blogspot.com 32. Bartons PendulumA EBDCWhich one has same length?Same length, same frequencywww.myfunphysicsworld.blogspot.com 33. Example of resonant system1. Playground swing2. Soprano3. Music instrument : guitar, flutewww.myfunphysicsworld.blogspot.com 34. www.myfunphysicsworld.blogspot.com 35. 1. Playground swingIf the `push is according to the swing naturalfrequency, the swing will resonate.Oscillate with maximum amplitudewww.myfunphysicsworld.blogspot.com 36. 2. Soprano singer breaking glasswww.myfunphysicsworld.blogspot.com 37. Tacoma Narrow Bridgewww.myfunphysicsworld.blogspot.com 38. Exersiceswww.myfunphysicsworld.blogspot.com 39. HomeworkQuick Review 1.1 Page 12 Question 2 only www.myfunphysicsworld.blogspot.com 40. www.myfunphysicsworld.blogspot.com 41. www.myfunphysicsworld.blogspot.com 42. barwww.myfunphysicsworld.blogspot.com 43. (a) Draw the wavefront of the water wave. www.myfunphysicsworld.blogspot.com 44. (b) Explain how wavefront canbe observed on the screenbelow the ripple tank.www.myfunphysicsworld.blogspot.com 45. Acts asConcavelensActs asConvexlens Crest acts like convex lens: converge the light onto the screen, produce bright pattern on the screen www.myfunphysicsworld.blogspot.com 46. QR1.1(c) What is the difference in of the waves obtained if the v of the motor increased?From vwater wave = f when vmotor increases, fmotor increases Hence, decreases*Vwater wave depended on depth www.myfunphysicsworld.blogspot.com 47. 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