1. Wave Interactions
Chapter 14-3

2. Wave Interactions There are 4 basic interactions
1. reflection-bouncing back of waves after it hits something it can’t pass through

3. Reflection 2 parts to a reflection- rays and angle of incident.
Ray- lines drawn in the direction of the wave

4. Rays continued 2 types of rays Incoming ray is called the incident ray
The bounce back ray is called the reflected wave

5. Angle of incident
The angle formed by the incident ray and an imaginary line drawn perpendicular.

6. The law of reflection states that the angle of incident is equal to the angle of reflection. Incoming ray is bounced off at the same angle.

7. Interactions
Diffraction- bending of waves around the edge of an obstacle.
The amount
of diffraction
depends on
the wavelength
and the size of the obstacle

8. Diffraction also occurs when passing through a small opening
Diffraction also occurs when passing through a small opening. They diffract and spread out as they pass through the hole.

9. Interactions
Refraction-waves travel in a straight line unless it goes into another medium then the wave bends because the speed of the waves change.

10. Interactions
Interference- 2 or more waves that arrive at the same place at the same time.
There are 2 ways waves combine
Constructive interference
Destructive interference

11. Interference con’t 1Constructive interference
Disturbance that results in a larger wave because 2 waves combine and the amplitude equals the sum of them both

12. Interference con’t Destructive interference
Disturbance that results in a smaller wave because 2 waves combine at the trough of one and crest of another.

13. Standing Waves
Def- a wave that does not appear to be moving.

14. Antinodes- constructive interference cause maximum energy displacement
Nodes- points at which destructive interference results in no energy displacement