Chapter 1: WAVES   www.myfunphysicsworld.blogspot.com
WAVES1.1 Waves1.2 Reflection of waves1.3 Refraction of waves1.4 Diffraction of waves1.5 Interference of waves1.6 Sound wav...
Learning outcomes 1 By the end of this lesson you should able to:Describe what is meant by wave motionRecognize that wav...
Throw a stone in a pool, what can you see? Ripple spread out in an expanding circle              www.myfunphysicsworld.blo...
Wave motionOscillating or vibratingmotion in which a pointor body moves back andforth along a line about afixed central po...
Oscillating/Vibrating System Oscillating/Vibrating system = Source Produces waves           www.myfunphysicsworld.blogspot...
WavesWaves transfer energyfrom 1 point to anotherWithout transferringmatter       www.myfunphysicsworld.blogspot.com
Matter                   ReceiverSource                  www.myfunphysicsworld.blogspot.com
      Trail of destruction in Penang                          www.myfunphysicsworld.blogspot.com
www.myfunphysicsworld.blogspot.com                          waves       transverse                     longitudinalThe vib...
Transverse Wave              www.myfunphysicsworld.blogspot.com
Longitudinal
crest                         troughLines joining all the points of the samephase : wavefront              www.myfunphysic...
Wavefronts are perpendicular to the direction ofpropagation of wave                                  www.myfunphysicsworld...
Learning outcomes 2By the end of this subtopic you should able to: Define amplitude, period, frequency, wavelength and  s...
Terms to describe wave:                                                 Unit?1. Wavelength Distance between 2 adjacent poi...
crest                         troughLines joining all the points of the samephase : wavefront              www.myfunphysic...
Wave form, showing wavelength & amplitude              www.myfunphysicsworld.blogspot.com
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Terms to describe wave:                                                 Unit?2. Amplitude (a or A)  maximum displacement f...
Swing of simple pendulumRelate displacement & amplitude          www.myfunphysicsworld.blogspot.com
3. Period Time taken for one complete oscillation of a wave            www.myfunphysicsworld.blogspot.com
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4. Frequency (f) The number of complete oscillation in one unit time     f = 1/T T = period   Frequency, f = Velocity, v  ...
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5. Wave speed The measurement of how fast a crest is moving from a fixed point               v = fλ             www.myfunp...
1. Displacement-time Graph     (of a particle on a wave)             Period >> time between 2             consecutive poin...
2. Displacement-distance Graph    (of a particle on a wave)         www.myfunphysicsworld.blogspot.com
Damping in an oscillating systemAmplitude decreasesPeriod & frequency constant            www.myfunphysicsworld.blogspot.com
ResonanceResonance is a phenomenon where asystem vibrates with maximum amplitudewhen the external frequency is the sameas ...
Barton’s PendulumA                                                   E      B                                        D    ...
Example of resonant system  1.   Playground swing  2.   Soprano  3.   Music instrument : guitar,       flute…            w...
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1. Playground swingIf the `push’ is according to the swing naturalfrequency, the swing will resonate.Oscillate with maximu...
2. Soprano singer breaking glass          www.myfunphysicsworld.blogspot.com
Tacoma Narrow Bridge    www.myfunphysicsworld.blogspot.com
Exersiceswww.myfunphysicsworld.blogspot.com
HomeworkQuick Review 1.1 Page 12     Question 2 only       www.myfunphysicsworld.blogspot.com
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bar      www.myfunphysicsworld.blogspot.com
(a) Draw the wavefront of the water wave.             www.myfunphysicsworld.blogspot.com
(b) Explain how wavefront canbe observed on the screenbelow the ripple tank.          www.myfunphysicsworld.blogspot.com
Acts asConcave  lens                                                        Acts as                                       ...
QR1.1(c) What is the difference in λ of the waves obtained if the v of the motor increased?  From vwater wave = fλ when vm...
Extra Exersices  www.myfunphysicsworld.blogspot.com
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1.1 waves

  1. 1. Chapter 1: WAVES www.myfunphysicsworld.blogspot.com
  2. 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 waves www.myfunphysicsworld.blogspot.com
  3. 3. Learning outcomes 1 By the end of this lesson you should able to:Describe what is meant by wave motionRecognize that waves transfer energy without transferring matterCompare transverse and longitudinal waves and give examples of eachstate what is meant by wavefront.State the direction of propagation of waves in relation to wavefronts. www.myfunphysicsworld.blogspot.com
  4. 4. Throw a stone in a pool, what can you see? Ripple spread out in an expanding circle www.myfunphysicsworld.blogspot.com
  5. 5. Wave motionOscillating or vibratingmotion in which a pointor body moves back andforth along a line about afixed central point www.myfunphysicsworld.blogspot.com
  6. 6. Oscillating/Vibrating System Oscillating/Vibrating system = Source Produces waves www.myfunphysicsworld.blogspot.com
  7. 7. WavesWaves transfer energyfrom 1 point to anotherWithout transferringmatter www.myfunphysicsworld.blogspot.com
  8. 8. Matter ReceiverSource www.myfunphysicsworld.blogspot.com
  9. 9.    Trail of destruction in Penang www.myfunphysicsworld.blogspot.com
  10. 10. www.myfunphysicsworld.blogspot.com waves transverse longitudinalThe vibration of The vibration of thethe medium is medium isperpendicular parallelto the direction of to the direction ofpropagation of the propagation of thewave wave Electromagnetic wave Sound wave
  11. 11. Transverse Wave www.myfunphysicsworld.blogspot.com
  12. 12. Longitudinal
  13. 13. crest troughLines joining all the points of the samephase : wavefront www.myfunphysicsworld.blogspot.com
  14. 14. Wavefronts are perpendicular to the direction ofpropagation of wave www.myfunphysicsworld.blogspot.com
  15. 15. Learning outcomes 2By the end of this subtopic you should able to: Define amplitude, period, frequency, wavelength and speed of wave. Sketch and interpret a displacement-time graph for a wave. Sketch and interpret a displacement-distance graph for a wave Clarify the relationship between speed, wavelength, and frequency. Describe damping in an oscillating system Describe resonance in an oscillating system www.myfunphysicsworld.blogspot.com
  16. 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 & rarefaction www.myfunphysicsworld.blogspot.com
  17. 17. crest troughLines joining all the points of the samephase : wavefront www.myfunphysicsworld.blogspot.com
  18. 18. Wave form, showing wavelength & amplitude www.myfunphysicsworld.blogspot.com
  19. 19. www.myfunphysicsworld.blogspot.com
  20. 20. Terms to describe wave: Unit?2. Amplitude (a or A) maximum displacement from its equilibrium position www.myfunphysicsworld.blogspot.com
  21. 21. Swing of simple pendulumRelate displacement & amplitude www.myfunphysicsworld.blogspot.com
  22. 22. 3. Period Time taken for one complete oscillation of a wave www.myfunphysicsworld.blogspot.com
  23. 23. www.myfunphysicsworld.blogspot.com
  24. 24. www.myfunphysicsworld.blogspot.com
  25. 25. 4. Frequency (f) The number of complete oscillation in one unit time f = 1/T T = period Frequency, f = Velocity, v Wavelength, λ f=v/λ www.myfunphysicsworld.blogspot.com
  26. 26. www.myfunphysicsworld.blogspot.com
  27. 27. 5. Wave speed The measurement of how fast a crest is moving from a fixed point v = fλ www.myfunphysicsworld.blogspot.com
  28. 28. 1. Displacement-time Graph (of a particle on a wave) Period >> time between 2 consecutive point in phase in a graphAmplitudeT = Period Frequency? Wavelength?
  29. 29. 2. Displacement-distance Graph (of a particle on a wave) www.myfunphysicsworld.blogspot.com
  30. 30. Damping in an oscillating systemAmplitude decreasesPeriod & frequency constant www.myfunphysicsworld.blogspot.com
  31. 31. ResonanceResonance is a phenomenon where asystem vibrates with maximum amplitudewhen the external frequency is the sameas natural frequency.External factor’s frequency //forcedfrequencynatural frequency: Every object has it’sown frequency : www.myfunphysicsworld.blogspot.com
  32. 32. Barton’s PendulumA E B D CWhich one has same length?Same length, same frequency www.myfunphysicsworld.blogspot.com
  33. 33. Example of resonant system 1. Playground swing 2. Soprano 3. Music instrument : guitar, flute… www.myfunphysicsworld.blogspot.com
  34. 34. www.myfunphysicsworld.blogspot.com
  35. 35. 1. Playground swingIf the `push’ is according to the swing naturalfrequency, the swing will resonate.Oscillate with maximum amplitude www.myfunphysicsworld.blogspot.com
  36. 36. 2. Soprano singer breaking glass www.myfunphysicsworld.blogspot.com
  37. 37. Tacoma Narrow Bridge www.myfunphysicsworld.blogspot.com
  38. 38. Exersiceswww.myfunphysicsworld.blogspot.com
  39. 39. HomeworkQuick Review 1.1 Page 12 Question 2 only www.myfunphysicsworld.blogspot.com
  40. 40. www.myfunphysicsworld.blogspot.com
  41. 41. www.myfunphysicsworld.blogspot.com
  42. 42. bar www.myfunphysicsworld.blogspot.com
  43. 43. (a) Draw the wavefront of the water wave. www.myfunphysicsworld.blogspot.com
  44. 44. (b) Explain how wavefront canbe observed on the screenbelow the ripple tank. www.myfunphysicsworld.blogspot.com
  45. 45. Acts asConcave lens Acts as Convex lens Crest acts like convex lens: converge the light onto the screen, produce bright pattern on the screen www.myfunphysicsworld.blogspot.com
  46. 46. QR1.1(c) What is the difference in λ of the waves obtained if the v of the motor increased? From vwater wave = fλ when vmotor increases, fmotor increases Hence, λ decreases*Vwater wave depended on depth www.myfunphysicsworld.blogspot.com
  47. 47. Extra Exersices www.myfunphysicsworld.blogspot.com
  48. 48. www.myfunphysicsworld.blogspot.com
  49. 49. www.myfunphysicsworld.blogspot.com
  50. 50. www.myfunphysicsworld.blogspot.com
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  64. 64. www.myfunphysicsworld.blogspot.com

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