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Waves chapter 12.1 cps

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Introduction to Types of Waves …

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

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  • 1. Integrated Science Unit 4, Chapter 12
  • 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. 12.1 Why study about waves? useful puzzling
  • 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. 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. 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. 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. 1. When you transmit informationwithout anything obviously moving,you are using waves.A. YesB. No
  • 9. 2. How many different types of wavesare there? 2.0 0.1
  • 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. 3. [Enter question here]A. TrueB. False
  • 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. *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. Compare/Contrast Wave TypesThe difference between the two types: 18
  • 15. These are transverse waves.A. TrueB. False 19
  • 16. This is a transverse wave:A. TrueB. False 20
  • 17. Sound travels through a longitudinal wave.A. TrueB. False 21
  • 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. *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. 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. 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. 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. 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. 4. There are two ways tomeasure a wave: from crest to crestA. Trueor trough to trough.B. False 28
  • 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. 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. Frequency, Amplitude and Wavelength
  • 28. 12.1 Wavelength
  • 29. *Speed of a Wave: frequency (cycles/sec)*speed (m/sec) v=fl wavelength (m)
  • 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. 6. What is the speed of a wave thathas a frequency of 5 hz and awavelength of 30 meters? 150.0 0.1
  • 32. The frequency of a wave is how oftenit goes up and down.A. TrueB. False
  • 33. The amplitude of a wave is thelargest amount it goes above orbelow the equilibrium.A. TrueB. False
  • 34. Waves are measured in joules.A. TrueB. False
  • 35. Waves transfer energy through thedisturbance of a medium.A. TrueB. False
  • 36. Frequency is the measurement ofheight of a wave.A. TrueB. False
  • 37. Sound is carried through transversewaves.A. TrueB. False
  • 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. Anatomy of a Wave: