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Waves

Waves. What types of waves are there?. Light Waves Sound Waves Ocean Waves Tsunami’s. Wave Demonstration. Light. Pre-assessment. What is a wave? What is the goal of a wave? Can you label these parts of a wave? Wavelength Crest Trough Amplitude. Waves.

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Waves

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  1. Waves

  2. What types of waves are there? • Light Waves • Sound Waves • Ocean Waves • Tsunami’s

  3. Wave Demonstration • Light

  4. Pre-assessment • What is a wave? • What is the goal of a wave? • Can you label these parts of a wave? • Wavelength • Crest • Trough • Amplitude

  5. Waves • A few basic properties of waves • Waves transfer energy • Waves need a medium • A wave is a disturbance that carries energy through matter and space. • Energy spreads out as a wave travels

  6. What is their medium? • Sound Waves • Ocean Waves • Light Waves

  7. What is their energy source? • Ocean waves • Your Radio • When you talk • Light from the sun • Light from a flashlight

  8. Waves Spreading Out? • Radio waves • Voice • Light-flashlight • Ripples in a pond.

  9. Parts of a Wave • Crest • Trough • Wavelength • Amplitude

  10. Review • Most waves are caused by what? • A wave is a disturbance that transmits what? • In an ocean wave, the molecules of water move which way? • Identify the medium for the following waves: • Ripples on a pond • The sound waves from a stereo speaker • Seismic waves

  11. Types of Waves • Two main types of waves- Longitudinal and Transverse • Longitudinal Waves- Have parallel motion, waves that cause particles to move parallel to the wave motion. • Transverse-motion of the particles is perpendicular to the motion of the wave.

  12. Parts of a transverse wave • Crest-highest point of a transverse wave. • Troughs-lowest point of a transverse wave. • Amplitude- the greatest distance that particles are displaced from their normal resting positions.

  13. Parts of a Longitudinal Wave • Two parts of a Longitudinal Wave • Compression- areas where the wave is crowded together. • Rarefactions-areas where the wave is spread out.

  14. Wave Measurements • Wavelength- measures the distance of two equivalent parts of a wave. • Period-measures how long it takes for one wave to pass by. • Frequency-measures the rate of vibrations.

  15. Frequency and Period Relationship • Frequency and period are inverses of each other. • What is an inverse relationship? • Sample Problem

  16. Relationship Between Wavelength and Period • Speed=displacement/time • Wave Speed=wavelength/period • Wave Speed=frequency x wavelength • Sample Problem

  17. Lab Tomorrow • Identifying the different parts of different waves. • Measuring the period, frequency and wavelengths of different waves.

  18. Rest of Class • I want you to draw a longitudinal and transverse wave. • Label the following parts. • Compression • Rarefaction • Crest • Trough • Amplitude • Wavelength • Define period and frequency. • Explain their relationship. • Wave Speed Equations

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