Light Waves Sound Waves Music Waves

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​Diffraction and Interference

Mr. Jaquish ​

​Review: Turn and Talk

What are 3 wave behaviors? ​

​Hint:

1. Mirrors

2. Soundproof walls

3. ​When pencil is in water it looks bent but really isn't!

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​That's Right!

3 Wave Behaviors are: ​

1. Refraction- waves bending when moving from one medium to another

2. Reflection- when waves hit a surface and bounce back ​

3. Absorption- when the waves energy is completely transferred into the medium ​

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Turn and Talk ​

​What kind of waves do you think allow us to hear music from the band room when we are standing down the hall?

Subject | Subject

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​Light waves

​Sound waves

​Sound Waves and Light waves

​If we can hear music down the hall and can see light from a doorway... which waves, do you think are bending more around an obsticle?

Diffraction is the bending of waves around or spread through a barrier ​

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Sound and light waves both can diffract ​

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Diffraction​

Multiple Choice

Do sound or light waves diffract further?

• sound waves

• light waves

Why does one travel farther than the other? ​

Sound Waves diffract more than light waves because of their.... ​

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Turn and Talk! ​

​ wavelength!

​Example of Diffraction

​Turn and Talk:

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If two water waves run into each other, what do you think will happen to the waves? ​

​Interference

​When 2 waves collide and overlap, they make a new wave

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This is interference

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After overlapping, the 2 original waves will go back and continue to travel their original path ​

​2 Types of Interference

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​Constructive Interference- when one crest of one wave overlaps with another.

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Destructive Interference- occurs when te crest of one wave overlaps with the trough of another ​

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