| P20 L29 Constructive Interference | Video | |
| P20 L29 Creating a Longitudinal Wave | Video | |
| P20 L29 Creating a Transverse Wave | Video | |
| P20 L29 Transmission and Reflection | Video | |
| P20 L29 Transverse and Longitudinal Waves | Video | |
| P20 L29 Wave Interference | Video | |
| P20 L29 Wave Reflection Fixed end | Video | |
| P20 L29 Wave Reflection Free end | Video | |
| P20 L30 Diffraction of Waves | Video | |
| P20 L30 Diffraction through a slit | Video | |
| P20 L30 Reflection of waves | Video | |
| P20 L30 Refraction of waves | Video | |
| P20 L31 2D Resonance | Video | |
| P20 L31 Coupled Pendulums | Video | |
| P20 L31 Pendulum Waves | Video | |
| P20 L31 Sound shatters a wine glass | Video | |
| P20 L31 Sound Waves | Video | |
| P20 L31 Standing Waves A | Video | |
| P20 L31 Standing Waves B | Video | |
| P20 L31 Tacoma Narrows Bridge Collapse | Video | |
| P20 L32 Doppler Effect | Video | |