| DCS # | DEMONSTRATION | REFERENCE | ABSTRACT |
|---|
| 3B35.00 | Reflection & Refraction (Sound) | | |
| 3B35.10 | gas lens | PIRA 1000 | |
| 3B35.10 | gas lens | 19-8.1 | Hydrogen and carbon dioxide balloons are used as diverging and converging lenses. Picture. |
| 3B35.10 | refraction lens - CO2 | S-95 | Make an acoustical lens by cementing the edges of two circular sheets of cellophane and filling the space between with CO2. |
| 3B35.20 | refraction prism - CO2 | PIRA 1000 | |
| 3B35.20 | refraction prism - CO2 | S-96 | Direct a beam of sound through a prism of CO2. |
| 3B35.22 | refraction with CO2 | S-97 | Set up a source, reflector, and detector. Then pour CO2 into the path of the incident beam to scatter the sound. |
| 3B35.30 | parabolic reflector and sound source | PIRA 1000 | |
| 3B35.30 | curved reflectors | S-93 | Place a watch at the focal point of a mirror and project the beam around the class. |
| 3B35.35 | directional transmission | Sg-2 | A Galton whistle at the focus of a parabolic mirror produces a beam detected by a microphone placed at the focus of a second parabolic mirror. |
| 3B35.36 | curved reflectors | S-92 | Place a whistle and sensitive flame several meters apart, then place a parabolic reflector behind the whistle. |
| 3B35.37 | reflection of sound waves | S-91 | A whistle and detector are placed in a line parallel with a reflector. Precautions may have to be taken to insure directionality of the sound waves. |
| 3B35.39 | curved reflectors | S-94 | Take a field trip a dome to observe the "whispering gallery" effect. |
| 3B35.50 | wave properties of sound | S-90 | Using a shrill whistle of wavelength from 2-8 cm, many properties of waves usually shown only with optics can be demonstrated. Many diagrams. |
| 3B35.60 | refraction of water waves | PIRA 1000 | |
| 3B35.60 | refraction of water waves | Disc 09-20 | Plane waves refract in a tank with deep and shallow sections. |