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# 1.1 waves

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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
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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
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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
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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
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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
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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
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