Mr. KufferMr. Kuffer

Wave Interference

When two wave pass each other their superpositionWhen two wave pass each other their superpositioncauses reinforcement or cancellation.causes reinforcement or cancellation.

Constructive interferenceReinforcement when the crest of one wave Reinforcement when the crest of one wave

overlaps the crest of another overlaps the crest of another Their individual effects adds together, Their individual effects adds together,

resulting in a wave increased in amplituderesulting in a wave increased in amplitude

Destructive InterferenceCancellation when crest of one wave overlaps trough of Cancellation when crest of one wave overlaps trough of

another reducing their individual effectsanother reducing their individual effectsWater waves show these best Water waves show these best

Out of phase- the crest of one wave arrives at a point at the Out of phase- the crest of one wave arrives at a point at the same time as a trough of the second wave arrives, effects same time as a trough of the second wave arrives, effects cancel each other cancel each other

In phase- two waves crests and troughs arrive at a place at In phase- two waves crests and troughs arrive at a place at the same time, effects reinforce each otherthe same time, effects reinforce each other

Sound Wave Interference

•Interference occurs when two sounds of difference frequency are heard superposed. •Constructive interference causes louder sound and destructive inference cause fainter sound.•This alternating pattern produces a beat. A piano tuners listens for beats to disappear.

Water Wave Interference

Left side is theoretical drawing of an interference pattern, Left side is theoretical drawing of an interference pattern, Like the Simulation you will use.Like the Simulation you will use.

Right side is the actual interference pattern, Like the Right side is the actual interference pattern, Like the beaches at Presque-Isle State Park.beaches at Presque-Isle State Park.

Standing WavesOccurs when a wave reflects upon itself and interference Occurs when a wave reflects upon itself and interference

causes the patterncauses the patternNodes remain stationary Nodes remain stationary Anti nodes-occur half way between nodesAnti nodes-occur half way between nodes

Standing WavesChange the frequency in a standing wave and more nodes/antinodes appear in the event, Demo!!!