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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?. Observe and see while I demonstrate with the wave machine. Let’s Discuss:.

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Presentation Transcript
slide2
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
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
Interference
  • When two or more waves meet, a new wave is made
  • This is known as interference
principle of superposition
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
Look at the diagram below:

What would the resultant wave look like???

technology using interference waves
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.
your turn
Your Turn…
  • You will be getting a handout.
  • Please complete.
  • Once you have finished the first handout ( both sides), you will be getting another handout or lets say a “package”.
  • The second handout or ‘package’ is also to be completed.
  • Enjoy 