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Waves

Waves. Light & Sound Regents Physics Mr. Rockensies. Homework Answers. 29) 432 m 30) 45 m 31) 8 s 32) 22 m 33) DE 34) 1 m/s 35) CD 36) AB (accelerating); EF, GH (decelerating). 22) 32 m 23) 0.4286 s 24) 3.03 s 25) 0 m 26) 2 m/s 27) 2 m/s 2 28) 7.35 m. Law of Reflection.

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Waves

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  1. Waves Light & Sound Regents Physics Mr. Rockensies

  2. Homework Answers 29) 432 m 30) 45 m 31) 8 s 32) 22 m 33) DE 34) 1 m/s 35) CD 36) AB (accelerating); EF, GH (decelerating) 22) 32 m 23) 0.4286 s 24) 3.03 s 25) 0 m 26) 2 m/s 27) 2 m/s2 28) 7.35 m

  3. Law of Reflection θi = angle of incidence θr = angle of reflection (both measured from the normal) θi normal θr θi = θr Rigid Boundary

  4. crest trough Rigid Boundary Orientation is inverted when reflecting off a rigid boundary

  5. Wave Interactions Interference – two waves occupy the same medium at the same time. It can either be constructive or destructive. Principle of Superposition – when waves overlap, add their amplitudes

  6. Before A1 A2 During A1 + A2 constructive interference After A2 A1

  7. Before +A -A During destructive interference After +A -A

  8. General

  9. Resonance Every medium has “natural frequencies” at which it likes to vibrate, due to length, tension, density, etc. When vibrating at these frequencies, constructive and destructive interference keep occurring at the same place. A “standing wave” is formed with Nodes (points of destructive interference) and Anti-Nodes (points of maximum constructive interference)

  10. Wave Diagram AN AN N N N N AN Sympathetic Vibration – When one object resonates, a second nearby object begins to vibrate at the same frequency

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