Notes pb lab 08 sounds cool

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Notes pb lab 08 sounds cool

  1. 1. Sounds CoolSounds Cool Exploring Sound waves http://www.youtube.com/watch? v=_ovMh2A3P5k
  2. 2. Key Objectives:Key Objectives: The student will investigate and understand the interactions of sound waves – Comprehend that resonance causes a second object to vibrate at the same frequency – Recognize everyday examples of sound waves that demonstrate constructive and destructive interference
  3. 3. Key TermsKey Terms Resonance Interference
  4. 4. Resonance When sound waves travel in phase – Can result in other objects vibrating at the same frequency – Glass vibrating and then breaking when a soprano sings
  5. 5. Interference The combination of two or more waves that results in a change in sound quality If it improves sound quality, it is called positive interference
  6. 6. Interference The combination of two or more waves that results in a change in sound quality If it lessens sound quality it is called destructive interference
  7. 7. Essential LearningsEssential Learnings Carefully read and copy each of these down after we discuss them!!!!!
  8. 8. Essential LearningsEssential Learnings All sound travels in longitudinal waves with a clear discernible and graphable pattern of compressions and rarefactions http://www.youtube.com/watch? v=27a26e2CnuM
  9. 9. Essential LearningsEssential Learnings The speed of sound through a material depends on the type of material – More dense the material (solid), the faster sound waves travel – Less dense the material (gas), the slower the waves travel
  10. 10. Essential Learnings Sound waves may be reflected from dense forms of matter. – Sonar http://www.youtube.com/watch? v=Z_E3zxx2l9g – Ultrasound http://www.youtube.com/watch? v=VJKc9WE7OaM
  11. 11. Essential Learnings When sound travels in phase, it is called resonance. – If it improves the sound quality it is called constructive interference – If it decreases sound quality it is destructive interference
  12. 12. Essential Learnings Constructive interference happens when rarefactions and compressions combine to increase sound quality (working together)
  13. 13. Essential Learnings Destructive interference happens when rarefactions and compressions cancel each other out (working in opposition) eliminating any sound
  14. 14. Essential LearningsEssential Learnings The End! 

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