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Waves

Waves. Waves. Waves play roles in our daily lives, including our effort to communicate. Waves have parts and shapes Waves interact with each other and objects Waves are involved in making music. Waves. Suppose a big meteor falls into the ocean. What would happen?. Waves.

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Waves

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  1. Waves

  2. Waves Waves play roles in our daily lives, including our effort to communicate. Waves have parts and shapes Waves interact with each other and objects Waves are involved in making music

  3. Waves Suppose a big meteor falls into the ocean. What would happen?

  4. Waves The energy of the falling meteor would create a wave that would carry the energy to distant shores

  5. Waves What happens when you go to a concert?

  6. Waves The singer’s voice and the instruments create waves that carry the sound to your ears.

  7. Waves A wave is an oscillation that travels from one place to another. The word oscillation means a motion that repeats regularly.

  8. Waves What are some examples of an oscillation in everyday life

  9. Waves If you poke a ball floating on water it moves up and down in harmonic motion. But something else happens to the water as the ball oscillates, what?

  10. Waves Waves carry information and energy Radio waves carry television signals Microwaves carry cellphone conversations or facebook updates

  11. Waves Waves are all around us (Oooooo)

  12. Waves Stoplights you see with your eyes Sounds you hear Ripples in a puddle of water Electricity flowing in wires Radio, TV, and cellphone transmissions

  13. Waves How do you know if there is a wave present?

  14. Waves Anytime you see a vibration that moves, wave Anything makes or responds to sound, wave Anything that makes or responds to light, wave Anything that transmits information through the air without wires, wave Anything that allows you to “see through” objects, wave (x-rays, CAT scans, MRI’s)

  15. Waves Waves spread through connections A wave moves along a string because the string is continuous. Continuous means it is connected to itself Is the ocean continuous?

  16. Waves Is the ocean continuous?

  17. Waves Two types of waves Mechanical Waves Need a medium to travel through Ex. Sound, water Electromagnetic waves Do not need a medium to travel through Ex. Light, radio

  18. Waves Waves have two shapes Longitudinal Transverse

  19. Waves Longitudinal Waves (compression waves) Moves parallel to the wave motion Sound waves are longitudinal waves

  20. Waves

  21. Waves Parts of a Longitudinal Wave •Compression -compact area of wave •Rarefaction -less dense area of compression Wave •A Wavelength of 1 longitudinal wave consists of 1 compression and 1 rarefaction

  22. Waves Transverse Waves Moves perpendicular to the direction the wave moves

  23. Waves

  24. Waves Parts of a Transverse Wave •Crest -highest point of wave •Trough -lowest point of wave •Wavelength -distance between one point in a wave and the exact point on the next wave. •Amplitude -distance from crest or trough to middle

  25. Waves Amplitude The amplitude of a wave is the largest amount that goes above or below average

  26. Waves Amplitude You can also think of the amplitude as one-half of the distance between the highest and lowest places .

  27. Waves Wavelength The length of one complete cycle of a wave

  28. Waves Wavelength is the distance from any point on a wave to the same point on the next cycle of the wave One wavelength is the length of one complete cycle of the wave.

  29. Waves We use the Greek letter “lambda” to represent wavelength. A lambda (λ) looks like an upside down “y.”

  30. Parts of a Transverse Wave

  31. Waves Frequency In an oscillator, frequency is the number of cycles it makes per second The unit of measurement is hertz (Hz) A frequency of one cycle per one second is one hertz

  32. Harmonic Motion Period Is the length of time for one cycle; how long it takes for one repetition

  33. Harmonic Motion Frequency and period are inversely related. The period is the time per cycle. The frequency is the number of cycles per time.

  34. Waves Speed The speed of a wave describes how fast the wave can transmit an oscillation one place to another. Waves can have a wide range of speeds

  35. Waves Speed Most water waves are slow, a few miles per hour is typical Light waves are extremely fast – 186,000 miles per second Sound waves – 660 miles per hour

  36. Waves

  37. Waves What is the speed of a wave?

  38. Waves Speed is frequency times wavelength In one complete cycle, a wave moves moves forward one wavelength.

  39. The wavelength for a wave is 0.5 meter, and its frequency is 40 hertz. What is the speed of this wave?

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