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Waves chapter 12.1 cps


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Introduction to Types of Waves
Including questions for einstruction student responders using CPS software.

Published in: Education
  • Light and its nature have caused a lot of ink to flow during these last decades. Its dual behavior is partly explained by (1)Double-slit experiment of Thomas Young - who represents the photon’s motion as a wave - and also by (2)the Photoelectric effect in which the photon is considered as a particle. A Revolution: SALEH THEORY solves this ambiguity and this difficulty presenting a three-dimensional trajectory for the photon's motion and a new formula to calculate its energy. More information on
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Waves chapter 12.1 cps

  1. 1. Integrated Science Unit 4, Chapter 12
  2. 2. Waves are everywhere in nature Sound waves, telephone chord visible light waves, waves, stadium waves, radio waves, earthquake microwaves, waves, water waves, waves on a string, slinky waves 2
  3. 3. 12.1 Why study about waves? useful puzzling
  4. 4. What is a wave? Read intro page 201*A wave is a disturbance that travels through a medium from one location to another.*A wave is the motion of a disturbanceExamples: Waves in water; Seismic waves in the Earth 4
  5. 5. 12.1 Waves Read page 201 If we poke a ball floating on water, it will bob up and down (harmonic motion).The oscillating ball creates a wave on the water surface. — What is oscillation? Oscillation is a system of harmonic motion The first ball can make a second ball that is farther away oscillate. (move) Explain the transfer of energy. Water Demo
  6. 6. 12.1 Waves Read page 201 *Harmonic Motion: Motion that repeats itself. Like a ball bobbing up and down in the water *What is oscillation? Oscillation is a system of harmonic motion Example: The first ball can make a second ball that is farther away oscillate. (move) Water Demo
  7. 7. Read page 20212.1 Evidence of waves  Anytime you see a vibration that moves  Anything that makes or responds to sound  Anything that makes or responds to light  Anythingthat transmits information through the air (or space) without wires — cell phones, radio, and television.  Anything that allows you to “see through” objects — ultrasound, CAT scans, MRI scans, and X rays
  8. 8. 1. When you transmit informationwithout anything obviously moving,you are using waves.A. YesB. No
  9. 9. 2. How many different types of wavesare there? 2.0 0.1
  10. 10. There are Two Types of Waves:1. *A transverse wave has its oscillations perpendicular to the direction the wave moves.(In other words: the wave bobs up and down) Read page 203
  11. 11. 3. [Enter question here]A. TrueB. False
  12. 12. There are Two Types of Waves: 2. *A longitudinal wave has its oscillations in the same direction as the wave moves.Read page 203
  13. 13. *Longitudinal WaveThe wave we see here is a longitudinal wave.The medium particles vibrate parallel to the motion of the pulse.*This is the same type of wave that we use to transfer sound.Can you figure out how?? show tuning fork demo 15
  14. 14. Compare/Contrast Wave TypesThe difference between the two types: 18
  15. 15. These are transverse waves.A. TrueB. False 19
  16. 16. This is a transverse wave:A. TrueB. False 20
  17. 17. Sound travels through a longitudinal wave.A. TrueB. False 21
  18. 18. Read page 204 Anatomy of a WaveNow we can begin to describe the anatomy of our waves.We will use a transverse wave to describe this since it is easier to see the pieces. 22
  19. 19. *Anatomy of a Wave*In our wave here the dashed line represents the equilibrium position.Once the medium is disturbed, it moves away from this position and then returns to it 23
  20. 20. Anatomy of a Wave crestThe points A and F are called the CRESTS of the wave.*The crest is the point where the wave exhibits the maximum amount of positive or upwards displacement. (the top of the wavelength) 24
  21. 21. Anatomy of a Wave troughThe points D and I are called the TROUGHS of the wave.*The troughs are the points at the bottom of wavelength) 25
  22. 22. Anatomy of a Wave Amplitude*The distance between the dashed line and point A is called the Amplitude of the wave.This is the maximum displacement that the wave moves away from its equilibrium. 26
  23. 23. Anatomy of a Wave wavelengthThe distance between two consecutive similar points (in this case two crests) is called the wavelength.*The wavelength is the length of the wave pulse.Between what other points is can a wavelength be measured? 27
  24. 24. 4. There are two ways tomeasure a wave: from crest to crestA. Trueor trough to trough.B. False 28
  25. 25. Wave frequencyWe know that frequency measure how often something happens over a certain amount of time.We can measure how many times a pulse passes a fixed point over a given amount of time, and this will give us the frequency. 29
  26. 26. Wave Frequency* The frequency of a wave is a measure of how often it goes up and down.*Wave frequency is measured in hertz. 30
  27. 27. Frequency, Amplitude and Wavelength
  28. 28. 12.1 Wavelength
  29. 29. *Speed of a Wave: frequency (cycles/sec)*speed (m/sec) v=fl wavelength (m)
  30. 30. 5. What is the speed of a wave thathas a frequency of 10 hz and awavelength of 50 m? 500.0 0.1
  31. 31. 6. What is the speed of a wave thathas a frequency of 5 hz and awavelength of 30 meters? 150.0 0.1
  32. 32. The frequency of a wave is how oftenit goes up and down.A. TrueB. False
  33. 33. The amplitude of a wave is thelargest amount it goes above orbelow the equilibrium.A. TrueB. False
  34. 34. Waves are measured in joules.A. TrueB. False
  35. 35. Waves transfer energy through thedisturbance of a medium.A. TrueB. False
  36. 36. Frequency is the measurement ofheight of a wave.A. TrueB. False
  37. 37. Sound is carried through transversewaves.A. TrueB. False
  38. 38. Your Turn: Answer these questions with a partner:1. Which of the following things must involve a wave? You may pick more than one. Explain each of your choices. a) A bulldozer is moving the dirt for a highway b) A person is talking to someone on a cell phone c) An earthquake in the Pacific Ocean causes a house to shake in Texas d) A car is going 70 miles per hour on a highway e) Two people stop to listen to a jet passing overhead f) A doctor takes an X ray to check for broken bones 2. Draw a Transverse Wave. Label the a wavelength, amplitude, crest and trough.
  39. 39. Anatomy of a Wave: