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