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Interference of Waves

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

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  1. Interference of Waves

  2. 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?

  3. Observe and see while I demonstrate with the wave machine.

  4. 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???

  5. Interference • When two or more waves meet, a new wave is made • This is known as interference

  6. 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

  7. Look at the diagram below: What would the resultant wave look like???

  8. 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.

  9. 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 

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