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What are Waves? A Disturbance where Energy is transferred Matter is not

What are Waves? A Disturbance where Energy is transferred Matter is not. Characteristics of a Wave. Two Classifications of Waves. Mechanical – moves through medium Electromagnetic – does not need medium to exist. Mechanical Waves. Use Matter to transfer Energy

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What are Waves? A Disturbance where Energy is transferred Matter is not

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  1. What are Waves? • A Disturbance where • Energy is transferred • Matter is not

  2. Characteristics of a Wave

  3. Two Classifications of Waves • Mechanical – moves through medium • Electromagnetic – does not need medium to exist

  4. Mechanical Waves • Use Matter to transfer Energy • The matter through which a wave travels is called the Medium • Examples • Air – Sound • Water – ripples in a pond • Solids – earth quakes

  5. Looks Like!!

  6. Sounds Like!! • An F/A-18 jet breaks the sound barrier

  7. Two Types of Mechanical Waves • Transverse • Longitudinal

  8. Wave Behavior How do waves do what they do?

  9. Reflection • Reflection of a wave occurs when the wave strikes an object or surface and bounces off.

  10. Sound Waves • When a sound wave reflects, it is known as an echo; the sound reflects from the surrounding surfaces, as in this photo of a canyon.

  11. Sound Wave Reflecting Off a Wall

  12. A Ships Sonar Reflects Sound off of the Ocean Floor

  13. Light Waves • A reflection in a mirror or a pond is a reflection of light bouncing back to your eyes. If the surface is smooth and even, the reflection will be clear.

  14. If the surface is uneven, like ripples in a pond, the light is reflected in many directions and the image is not clear.

  15. Refraction Refraction • Refraction is the bending of a wave as it moves from one medium into another.

  16. Refraction is what gives the illusion of a bent straw or spoon in a clear glass of water. Light waves travel faster in air than in water, so as it passes through the water, it slows down and appears to bend.

  17. As light passes through a prism, such as a crystal or a drop of water, refraction causes light to bend and separate into many colors and produces a rainbow.

  18. ROYGBIV ROYGBIV • The colors go in order of ROYGBIV: Red, Orange, Yellow, Green, Blue, Indigo, and Violet. This is the order of the colors seen in a rainbow. It is also the order of visible light in the electromagnetic spectrum.

  19. Each color refracts at a different angle because of their different wavelengths.

  20. Red is first because it has the longest wavelength so it bends the least. Blue bends most because it has the shortest wavelength.

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