1. WavesSection 3 Reflection, Diffraction, and Refraction How do waves behave when they hit a boundary, when they pass around an edge or opening, and when they pass from one medium to another?

2. WavesSection 3 15-3-1 Reflection, Diffraction, and Refraction, continued reflection: the bouncing back of a ray of light, sound, or heat when the ray hits a surface that it does not go through

3. WavesSection 3 15-3-2 Reflection, Diffraction, and Refraction, continued Examples: The reflection of light waves from a mirror or water waves reflected when they hit the side of a boat.

4. WavesSection 3 15-3-3 Reflection, Diffraction, and Refraction, continued diffraction: a change in the direction of a wave when the wave finds an obstacle or an edge, such as an opening

5. WavesSection 3 15-3-4 Reflection, Diffraction, and Refraction, continued Examples: Water waves diffract around a block in a tank of water and sound waves passing through a door diffract.

6. WavesSection 3 15-3-5 Reflection, Diffraction, and Refraction, continued refraction: the bending of a wavefront as the wavefront changes speed as it passes from one medium to another at an angle

7. WavesSection 3 Interference What happens when two waves are in the same location?

8. WavesSection 3 15-3-6 Interference interference: the combination of two or more waves that results in a single wave

9. WavesSection 3 15-3-7 Interference, continued constructive interference: an increase in amplitude due to a superposition of two or more waves that produces an intensity equal to the sum of the intensities of the individual waves

10. WavesSection 3 15-3-8 Interference, continued destructive interference: a decrease in amplitude due to a superposition of two or more waves that produce an intensity equal to the difference of the intensities of the individual waves

11. WavesSection 3 Interference, continued

12. WavesSection 3 Standing Waves How are standing waves formed?

13. WavesSection 3 15-3-10 Standing Waves standing wave: a pattern of vibration that simulates a wave that is standing still

14. WavesSection 3 15-3-11 Standing Waves, continued Each loop of a standing wave is separated from the next loop by points that have no vibration, called nodes.

15. WavesSection 3 15-3-12 Standing Waves, continued Midway between the nodes lie points of maximum vibration, called antinodes.