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Bell Ringer

Bell Ringer. How would you describe a wave to someone who had never seen one before? List 3 different types of waves. Intro to Waves. Physical Science. Agenda. Guided Notes: Introduction to Waves Parts of a Wave Transverse & Longitudinal Boundary Interactions

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Bell Ringer

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  1. Bell Ringer • How would you describe a wave to someone who had never seen one before? • List 3 different types of waves.

  2. Intro to Waves Physical Science

  3. Agenda • Guided Notes: Introduction to Waves • Parts of a Wave • Transverse & Longitudinal • Boundary Interactions • Constructive & Destructive Interference

  4. What is a Wave? • A wave is a disturbance that carries energy from one place to another. • A medium is the substance that the wave travels through. • Example 1: When there are waves on the ocean the medium is water. • Example 2: When sound travels across the room the medium is air.

  5. WATER is the MEDIUM AIR is the MEDIUM

  6. Parts of a Wave • There 3 ways that waves can be measured: • Wavelength: How far apart the waves are. • Amplitude: How tall the wave is. • Frequency: How many waves pass by in a period of time.

  7. Amplitude Wavelength Crest Resting Position Amplitude Trough

  8. Transverse and Longitudinal Waves • A transverse wave vibrates up and down while the wave travels from left to right. • These are the “normal” waves that people usually picture. • A longitudinal wave vibrates left and right as the wave travels from left to right. • These waves do not vibrate up and down.

  9. Transverse and Longitudinal Waves • http://www.youtube.com/watch?v=Rbuhdo0AZDU

  10. Boundary Reactions • As a wave travels, it sometimes moves out of one medium and into another • This transition is called a boundary, and it might affect waves in 4 different ways • Absorption • Reflection • Diffraction • Refraction

  11. Absorption • Soft boundaries absorb waves. • This means that the waves energy dies out. • Example: Yelling into a pillow.

  12. Reflection • Hard boundaries reflect waves • This means that the wave bounces off of the boundary’s surface • Example: Yelling against a wall

  13. Diffraction • Corners diffract waves • This means the wave bends around the corner • Example: Talking to someone around a corner

  14. Refraction • Transparent boundaries refract • This means that the wave bends when it moves into a medium that is faster or slower • Example: Light bends as it passes from air and into the glass of eyeglass lenses

  15. Constructive Interference • When two waves meet, they can be added together if they are “in-phase.” This means that the high and low points of the wave are matched. • When this happens the waves add together in a process called constructive interference.

  16. Destructive Interference • When two waves meet, they can cancel each other if they are “out-of-phase.” This means that the high and low points of the wave are not matched. • When this happens the waves cancel each other in a process called destructive interference.

  17. End of Intro to Waves Physical Science

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