1. 1. Reflection 2. Refraction 3. Diffraction 4. Interference
1.3 Interactions of waves
1. Reflection
2. Refraction
3. Diffraction
4. Interference

2. Reflection: when a wave hits a surface and bounces back
Law of Reflection: the angle of incidence = the angle of reflection

3. Refraction: when a wave enters a new medium at an angle, one side changes speed before the other… causing it to bend
Waves move through different mediums at different speeds.

4. Refraction examples

5. Diffraction: when waves bend and spread out around barriers or through openings

6. Interference: when two waves meet there is an interaction.
Constructive vs. Destructive
(the crests add up) (the crests cancel out)

7. Constructive vs. Destructive

8. Resonance: an increase in the amplitude of a vibration when the external disturbance matches the object’s natural frequency.
Constructive
Interference