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Waves

Waves. 327 - 336. What is a wave? It is a repeating disturbance. What is a wave? It is a repeating disturbance. What is a wave? It is a repeating disturbance. Mechanical Waves Waves that need a medium (stuff) to pass through. Waves can only exist, if there is energy to transfer.

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Waves

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  1. Waves 327 - 336

  2. What is a wave? It is a repeating disturbance.

  3. What is a wave? It is a repeating disturbance.

  4. What is a wave? It is a repeating disturbance.

  5. Mechanical Waves Waves that need a medium (stuff) to pass through. Waves can only exist, if there is energy to transfer. Solid ~ earthquake Liquid ~ Tsunami Gas ~ sound Plasma ~ interstellar movements

  6. Electromagnetic Do NOT need a medium to travel through. This is going to be any of the forms of light.

  7. Water waves are BOTH, compressional and transverse.

  8. “According to a Japanese folktale, a venerable grandfather who owned a rice field at the top of a hill felt the sharp jolt of an Earth tremor one day just before the harvest. From his hilltop vantage point, he saw the sea pull back from the shore. Curious villagers rushed out to explore the exposed tidal flats and collect shellfish. From experience, the old man knew of the grave danger to his neighbors. With his grandson by his side, he dashed about his fields, setting fire to his crop. The villagers saw the smoke, and hurried up the hill to aid their neighbor. As they beat out the flames, they saw the old man scurrying ahead, setting new fires near the hill’s crest. Hoping to prevent him from destroying all of his crops, they rushed up the hill to stop him. Moments later, the villagers saw a tremendous wall of water surging onshore, flooding the flats where they had just been standing and they understood that the old man had sacrificed his harvest to save their lives.”

  9. Transverse wave ~ wave goes at right angles to the direction of the wave itself. All electromagnetic waves are transverse Not all transverse wave are electromagnetic.

  10. Compressional waves~ A wave that moves along the same direction as the medium of movement.

  11. Earthquakes have both

  12. Waves are defined by five things. Wave height Amplitude Wavelength Crest Trough

  13. Crest Wave height Trough

  14. Calculating Wave Speed OK, this is not brutal, just a bit confusing. velocity = wavelength • frequency velocity is m/s wavelength is m frequency is Hz (cycles per second). Hz is the SI unit of frequency.

  15. Calculating Wave Speed OK, this is not brutal, just a bit confusing. velocity = wavelength • frequency velocity is m/s wavelength is m frequency is Hz (cycles per second). Hz is the SI unit of frequency. Velocity is 5 meters • 100 cycle = 500 meters • cycles cycle second cycles • second

  16. Calculating Wave Speed OK, this is not brutal, just a bit confusing. velocity = wavelength • frequency velocity is m/s wavelength is m frequency is Hz (cycles per second). Hz is the SI unit of frequency. Velocity is 5 meters • 100 cycle = 500 meters • cycles cycle second cycles • second

  17. If a wave is moving at 30 m/s If it has a frequency of 10 Hz What is its wavelength? velocity = wavelength • frequency

  18. If a wave is moving at 300,000,000 m/s (light speed) If it has a frequency of 1,400,000 Hz (KLIN radio) What is its wavelength? velocity = wavelength • frequency

  19. If a wave is moving at 300,000,000 m/s (light speed) If it has a frequency of 1,400,000 Hz (KLIN radio) What is its wavelength? velocity = wavelength • frequency 300,000,000 m/s = (wavelength) • 1,400,000 Hz

  20. If a wave is moving at 300,000,000 m/s (light speed) If it has a frequency of 1,400,000 Hz (KLIN radio) What is its wavelength? velocity = wavelength • frequency 300,000,000 m/s = (wavelength) • 1,400,000 Hz So…(wavelength) = 300,000,000 ÷ 1,400,000

  21. If a wave is moving at 300,000,000 m/s (light speed) If it has a frequency of 1,400,000 Hz (KLIN radio) What is its wavelength? velocity = wavelength • frequency 300,000,000 m/s = (wavelength) • 1,400,000 Hz So…(wavelength) = 300,000,000 ÷ 1,400,000 So…….. A radio wave from KLIN radio is 214 meters long, about as long as two football fields.

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