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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Light & Sound
29) 432 m
30) 45 m
31) 8 s
32) 22 m
34) 1 m/s
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
θi = angle of incidence
θr = angle of reflection
(both measured from the normal)
θi = θr
Orientation is inverted when reflecting off a rigid boundary
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
A1 + A2
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)
Sympathetic Vibration – When one object resonates, a second nearby object begins to vibrate at the same frequency