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# Waves PowerPoint PPT Presentation

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.

Waves

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## Waves

Light & Sound

Regents Physics

Mr. Rockensies

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

### Law of Reflection

θi = angle of incidence

θr = angle of reflection

(both measured from the normal)

θi

normal

θr

θi = θr

Rigid Boundary

crest

trough

Rigid Boundary

Orientation is inverted when reflecting off a rigid boundary

### 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

Before

A1

A2

During

A1 + A2

constructive interference

After

A2

A1

Before

+A

-A

During

destructive interference

After

+A

-A

General

### 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)

### 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