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What are waves?

MT 6 LT 1. Mechanical Waves. What are waves?. Background Knowledge: Waves. What are some examples of waves? Why are waves important?. What causes waves?. Waves are created when a source of E nergy causes a medium to vibrate . WAVES NEED ENERGY TO MOVE

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What are waves?

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  1. MT 6 LT 1 Mechanical Waves What are waves?

  2. Background Knowledge: Waves • What are some examples of waves? • Why are waves important?

  3. What causes waves? • Waves are created when a source of Energycauses a medium to vibrate. • WAVES NEED ENERGY TO MOVE • A vibration is a repeated back and forth or up and down motion.

  4. What are the different types of Wave? • Mechanical Waves • Sound Waves • Electromagnetic Waves

  5. This LT will focus on Mechanical Waves

  6. What are mechanical waves? • Definition: A disturbance that transfers energy from place to place. • They need a source of energy to produce it

  7. How are waves & energy related? • A wave transports energy along a Mediumwithout transporting matter.

  8. Mediums & Waves • What do mechanical waves move through? • A medium • Mechanical waves require a medium in order to travel from one place to another • Can be gas, liquid, or solid. • Waves in different mediums travel at different speeds.

  9. Mediums & Waves • What do mechanical waves move through? • Mechanical Waves do NOT move the medium from one place to another • Note that Not all waves require a medium to travel. • Example: Light from the sun travels through empty space.

  10. What determines the speed of a Mechanical Wave? • The speed of a wave is determined by its: • Wavelength x Frequency

  11. What are the different types of Mechanical Waves?

  12. What are the different types of Mechanical Waves? • Waves are classified according to how they move. • 3 types of Waves: • Transverse Wave • Longitudinal Wave • Surface Wave

  13. What is a Transverse Wave? • A wave that travels in the opposite direction (perpendicular) to the medium in which it is traveling through • Transverse means across.

  14. Basic Properties of Transverse Waves (What are the parts of a Transverse Wave?) • Crest • Trough • Amplitude • Energy • Wavelength

  15. Basic Properties of Transverse Waves (What are the parts of a Transverse Wave?) • Crest • The highest point of the wave above the rest position • Trough • The lowest point below the rest position

  16. Transverse Wave: Amplitude • Amplitude is the distance from the rest to crest or rest to trough. • The farther a medium moves as it vibrates, the larger the amplitude. Rest

  17. Transverse Wave: Amplitude • The Amplitude tells us the amount of energy being transported. • High Energy = High Amplitude • Low Energy = Low Amplitude.

  18. Transverse: Wavelength • A wave travels a certain distance before it repeats. • When it repeats, it is knows as the Wavelength • The wavelength is the distance between 2 corresponding (same/related) parts of a wave . • Measured from crest to crest or trough to trough.

  19. Wave Height • The distance from one crest to one trough (trough to crest too)

  20. Draw a Transverse Wave and label: crest & trough

  21. Properties of Longitudinal/Compressional Waves

  22. Longitudinal Wave • The vibration of the medium is the same direction (parallel) to the direction in which the wave travels. • Example: Slinky

  23. Longitudinal Wave • Compressions: • The parts where the coils are close together • Rarefactions • the parts where the coils are spread out

  24. What is a Surface Wave?

  25. Surface Waves • A wave that travels along a surface separating two media

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