more than one wave can exist at the same time in the same space. An interference pattern is a regular arrangement of places where wave effects are increased,

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Presentation transcript:

more than one wave can exist at the same time in the same space. An interference pattern is a regular arrangement of places where wave effects are increased, decreased, or neutralized Interference

a.In constructive interference, the waves reinforce each other to produce a wave of increased amplitude called reinforcement Interference

a.In constructive interference, the waves reinforce each other to produce a wave of increased amplitude called reinforcement. b.In destructive interference, the waves cancel each other and no wave is produced called cancelation Interference

Wave interference is easiest to see in water as an interference pattern. When waves are out of phase, the crests of one wave overlap the troughs of another to produce regions of zero amplitude. When waves are in phase, the crests of one wave overlap the crests of the other, and the troughs overlap as well Interference

a.Two overlapping water waves produce an interference pattern Interference

a.Two overlapping water waves produce an interference pattern. b.Overlapping concentric circles produce a pictorial representation of an interference pattern Interference

KEY POINT to clarify Interference is characteristic of all wave motion, whether the waves are water waves, sound waves, or light waves Interference

What causes interference patterns? 25.7 Interference Interference patterns occur when waves from different sources arrive at the same point—at the same time.

Certain parts of a standing wave remain stationary. Nodes are the stationary points on a standing wave. The positions on a standing wave with the largest amplitudes are known as antinodes Standing Waves Standing waves are the result of interference.

25.8 Standing Waves Answer: Yes. This is called destructive interference. In a standing wave, for example, parts of the wave have no amplitude—the nodes.

1.The time it takes for a pendulum to swing to and fro is considered its a.frequency. b.period. c.wavelength. d.amplitude. Assessment Questions

2.The frequency of a wave is the inverse of its a.frequency. b.period. c.wavelength. d.amplitude. Assessment Questions

3.A wave transfers a.amplitude. b.wavelength. c.frequency. d.energy. Assessment Questions

4.The speed of a wave can be found by multiplying its frequency by the a.period. b.wavelength. c.amplitude. d.density of the medium that carries the wave. Assessment Questions

5.The vibrations along a transverse wave move in a direction a.along the wave in the same direction. b.perpendicular to the wave. c.parallel to the wave. d.along the wave in the opposite direction. Assessment Questions

6.The vibrations along a longitudinal wave move in a direction a.along and parallel to the wave. b.perpendicular to the wave. c.below the wave. d.above the wave. Assessment Questions

7.Interference is characteristic of a.only sound waves. b.only light waves. c.only water waves. d.all waves. Assessment Questions

8.Standing waves a.appear to be constantly moving. b.are the result of waves overlapping in phase and out of phase. c.form only in multiples of three. d.do not increase with increasing frequency. Assessment Questions