Interference of Waves

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# Interference of Waves - PowerPoint PPT Presentation

Interference of Waves. What happens when two waves meet? Okay, how did these two waves meet? Did they meet on eHarmony?? Ha,Ha,Ha  Now I am serious… Does the wave get bigger? Does it get smaller?. Observe and see while I demonstrate with the wave machine. Let’s Discuss:.

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### Interference of Waves

What happens when two waves meet?
• Okay, how did these two waves meet?
• Did they meet on eHarmony??
• Ha,Ha,Ha 
• Now I am serious…
• Does the wave get bigger?
• Does it get smaller?
Let’s Discuss:
• What did you observe?
• Two crests going in the opposite direction will _________________ when they meet.
• A crest and a trough moving in the opposite direction will ___________ when they meet.
• What happens after they meet?
• What did you see???
Interference
• When two or more waves meet, a new wave is made
• This is known as interference
Principle of Superposition
• This principle states at any point, the amplitude of the two interfering waves is the sum of the amplitudes of the individual waves
• Constructive interference: two or more waves create a larger amplitude
• Destructive interference: two or more waves create a smaller amplitude
Look at the diagram below:

What would the resultant wave look like???

Technology Using Interference Waves
• Noise cancelling headphones use the concept of destructive interference. The electronics inside the headphones generate a wave that is out of phase with sound waves in the exterior environment.
• This out of phase wave is played inside the headset
• Using destructive interference the outside noise is cancelled, allowing the listener to play music at lower volumes.