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1. A World of Waves

1. A World of Waves. 2. Carrying and Causing Waves. 3. A wave can travel through water, air, and ropes acting as a medium. Therefore waves can travel through solids, liquids or gases.

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1. A World of Waves

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  1. 1. A World of Waves

  2. 2. Carrying and Causing Waves • 3. A wave can travel through water, air, and ropes acting as a medium. Therefore waves can travel through solids, liquids or gases. • 3. Waves are generated when a source of energy forces the matter in a medium to vibrate causing vibrations.

  3. 2. Generating Waves • 3. Transverse Wave-. The medium creates a right angle in the direction of the wave. As the wave moves up and down, the particles move in the same direction (Ex. Rope) . Crest-high part Troughs-low parts

  4. Please draw and label

  5. Examples of Transverse Waves • S Wave (secondary waves during an earthquake to reach seismograph) • Light waves • Radio Waves • Heat waves

  6. 2. Longitudinal Waves • 3. Particles in medium move parallel to the directions the wave is traveling. (Ex. Slinky) Compressions-particles are close Rarefaction- particles are Spread Out

  7. Draw and Label

  8. Examples of Longitudinal Waves • P Waves (can travel through solids and liquids, Primary waves are the first waves to reach seismograph during earthquake) • travel only through solids & liquids • Sound Waves • Pressure Waves

  9. 2. Combination of Waves • 3. Transverse + Longitudinal = Surface Waves • Traveling through two different media such as water and air. Crest or Trough? Crest or trough?

  10. Surface Wave • Notice that the blue dot is not moving across the water it is only bobbing up and down and side to side creating a circular motion. The energy is moving, not the dot.

  11. Example of Surface Wave • Water Wave- Wind causes most water waves. The wind transfers energy to water creating water wave. Ex. Waves generated during a hurricane.

  12. 2. Properties of a Wave • 3. Amplitude- Maximum distance particles move from rest. • 3. Wavelength- distance between two corresponding parts of a wave

  13. 3. Frequency- measured in hertz (Hz). Number of complete waves that pass a given point in a certain amount of time. Frequency = Speed / Wavelength Solve: The speed of a wave on a rope is 50 cm/s and its wavelength is 10cm. What is the frequency?

  14. 3. Speed- Different waves travel at different speeds. Example: Lightening and thunder occur at the same time. However, light travels faster than sound. • Speed = Wavelength x Frequency • Solve: A wave has the length of 5mm and a • frequency of 2 Hz. At what speed does the • wave travel?

  15. 2. Interactions of Waves • 3. Reflection- When a wave hits an object or surface in which it can’t pass, it bounces back (Example: wave hitting the side of a pool)

  16. 3. Refraction- Bending of waves due to a change in speed and wavelength when passing into a new substance

  17. 3. Diffraction- change in direction of waves as they pass through an opening or around a barrier in their path. Water waves have the ability to travel around corners, around obstacles and through openings (Detour)

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