1. Do now: Warm up 1/26 Copy Question explain your answer
Stick one medium with another, will the wave transfer over?
What do you think will happen to the wave if it traveled from the ?

2. Wave interaction/interference
I sense a disturbance...

4. Reflection – Bounce back wave
Sound waves that are reflected are called echoes
Used in sonar and echolocation
How wave is reflected depends on if the end if “fixed” or free
Opposite wave reflected
Same side wave

5. Refraction
The bending of a wave due to the wave moving from one type of medium into another.
Caused by change in wave speed through the new medium

6. Diffraction
Wave passing a barrier or going through a hole in a barrier bends causes the wave to wrap around the barrier
ex) Hearing music playing but not knowing where it’s coming from or hearing sounds under water

7. Mediums and changes in mediums
A wave is traveling down a medium and hits a boundary.
At this point one medium transfers to another

8. Mediums and changes in mediums
the wave travels down medium and hits boundary
Boundary is hit and the wave is reflected back and transmitted down the medium
The transmitted pulse is upright, the reflected pulse is inverted

9. How waves interact: AKA interference
Constructive Interference :
When a wave has the same amplitude position
Destructive Interference:
When two waves meet and have opposite amplitudes

10. constructive interference
Waves with same amplitude meet
Adds together to make a greater amplitude

11. destructive interference
Waves with opposite amplitudes meet
Waves meet and create smaller waves
Wave keep moving along medium

13. Standing Waves
Standing Waves – the combining of the incoming and reflected wave so that the resultant wave appears to be standing still
Node – the point where Constructive Interference and Destructive Interference cause an amplitude of zero on the standing wave (no motion).