Speed of Sound, Refraction, Trick, Light Bulb Filament, Glass Duet, Spell Check, Stars and more (2x5)
Air date: Jan 07, 1985
Speed of Sound, Selective Refraction Trick, How Many Stars, Glass Duet, Spelling Checker, After a Forest Fire, Window Oscillation, Asparagus, Finding a Tree's Height. Mr. Wizard measures the difference between hearing the sound of a starter pistol over the walkie-talkie and hearing it through the air.
