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Chapter 19 Vibrations And Waves Part 1
Chapter 19 Vibrations And Waves Part 1
Chapter 19 Vibrations And Waves Part 1
Chapter 19 Vibrations And Waves Part 1
Chapter 19 Vibrations And Waves Part 1
Chapter 19 Vibrations And Waves Part 1
Chapter 19 Vibrations And Waves Part 1
Chapter 19 Vibrations And Waves Part 1
Chapter 19 Vibrations And Waves Part 1
Chapter 19 Vibrations And Waves Part 1
Chapter 19 Vibrations And Waves Part 1
Chapter 19 Vibrations And Waves Part 1
Chapter 19 Vibrations And Waves Part 1
Chapter 19 Vibrations And Waves Part 1
Chapter 19 Vibrations And Waves Part 1
Chapter 19 Vibrations And Waves Part 1
Chapter 19 Vibrations And Waves Part 1
Chapter 19 Vibrations And Waves Part 1
Chapter 19 Vibrations And Waves Part 1
Chapter 19 Vibrations And Waves Part 1
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Chapter 19 Vibrations And Waves Part 1

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  • 1. Physics – Semester 2 – Waves, Electricity, and Light http://nguyen.edublogs.org
  • 2. Things for Class... <ul><li>Please bring a pencil, pen, highlighter, straight edge, paper, and scientific calculator to class every day </li></ul><ul><li>I will provide you with graph paper and a textbook </li></ul>
  • 3. Let’s take notes… <ul><li>The notes you take in class are for yourself. </li></ul><ul><li>Practice taking notes in a style that works for you (Cornell, draw pictures and diagrams, clouds, flowchart, etc) </li></ul><ul><li>Review your notes daily </li></ul>
  • 4. Exams Topics <ul><li>Exam I - Sound Chapters 19, 20, 21 </li></ul><ul><li>Exam II – Electricity and Magnetism Chapters 23, 24, 25 </li></ul><ul><li>Exam III - Light Chapters 26, 27, 28, 29, 30 </li></ul><ul><ul><li>Final Exam </li></ul></ul>
  • 5. Chapter 19 Vibrations and Waves
  • 6. Vibrations and Waves <ul><li>Oar in Water </li></ul><ul><li>Wings of a Bee </li></ul><ul><li>Electrons in an Light Bulb </li></ul><ul><li>Water Waves </li></ul><ul><li>Sound Waves </li></ul><ul><li>Light Waves </li></ul>
  • 7. Vibrations and Waves <ul><li>Waves transmit energy and information . </li></ul><ul><li>Sound and Light are both waves. </li></ul>
  • 8. Simple Harmonic Motion... <ul><li>… is to-and-fro (back and forth) vibratory motion. </li></ul><ul><li>...results in sine curves. </li></ul><ul><li>Examples: </li></ul><ul><ul><li>metronome </li></ul></ul><ul><ul><li>mass on a spring </li></ul></ul><ul><ul><li>pendulum </li></ul></ul>
  • 9. Pendulums &amp; Galileo <ul><li>The period does not depend on the amount of mass. </li></ul><ul><li>The period does depend on the length of the pendulum. </li></ul>T = period l = length of pendulum g = gravity
  • 10. Wave Description <ul><li>Period - the time required for one vibration </li></ul><ul><ul><ul><li>measured in seconds </li></ul></ul></ul><ul><li>Frequency - number of vibrations per unit time </li></ul><ul><ul><ul><li>measured in Hertz </li></ul></ul></ul>
  • 11. Wave Description
  • 12. <ul><li>Example Test Question: </li></ul><ul><li>If you double the frequency of a vibrating object, what happens to the period? </li></ul><ul><li>a) the period doubles </li></ul><ul><li>b) the period stays the same </li></ul><ul><li>c) the period is cut in half d) not enough information is given </li></ul><ul><li> to answer this question. </li></ul>* 
  • 13. <ul><li>What is the frequency in vibrations per second of a 60-Hz wave? </li></ul><ul><li>Answer: 60 cycles per second </li></ul><ul><li>What is its period? </li></ul><ul><li>Answer: 1/60 second </li></ul>
  • 14. Sine Curves <ul><li>Amplitude - distance from the baseline to the crest of a wave </li></ul><ul><li>Wavelength - the distance from the top of one crest to the top of the next one </li></ul>Wavelength ( λ )
  • 15. Example Test Questions Answer these questions using the sine wave provided. <ul><li>What is the amplitude of the wave? </li></ul><ul><li>What is its wavelength? </li></ul>
  • 16. 2 ½ meters 20 cm Wavelength = 1 m Example Wave Amplitude = 10 cm
  • 17. Wave Motion <ul><li>medium - the stuff that carries the wave </li></ul>Waves Medium water waves water waves on a rope rope stadium waves people sound air light space (vacuum)
  • 18. Wave Speed... <ul><li>the speed with which waves pass by a particular point </li></ul><ul><ul><ul><li>e.g. the speed of a surfer </li></ul></ul></ul><ul><li>It depends only on the type of medium. </li></ul><ul><li>Wave Speed = Frequency  Wavelength v = f x λ </li></ul>
  • 19. <ul><li>If a water wave oscillated up and down three times each second and the distance between wave crest is 2 m, what is its frequency? </li></ul><ul><li>Answer: 3 Hz </li></ul><ul><li>What is its period? </li></ul><ul><li>Answer: 1/3 second </li></ul><ul><li>What is its wavelength? </li></ul><ul><li>Answer: 2 m </li></ul><ul><li>What is its wave speed? </li></ul><ul><li>Answer: 6 m/s </li></ul>
  • 20. End of Part 1

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