Gallery
Discover apps people built on Collabby by chatting. Run them, then remix to make them yours.
When Vibrations Become Sound
〰️ What happens when we halve a wavelength? The number of vibrations doubles! At the same speed, «length» and «frequency» move in opposite directions. Watch the curve become more tightly packed before your eyes. 🔊 When you hear the wave, frequency becomes «pitch» and amplitude becomes «volume». Yet some sounds with the same pitch and volume still sound different. Find out why a piano and violin play the same note differently—listen for yourself. 🏃 Finally, discover what carries sound. Ring a bell in a vacuum and you hear nothing. Sound travels fourteen times faster through steel than through air—that’s why a train can be heard sooner with your ear on the rail. This app was made with code too · Shall we remix it and add an echo?
I Believe It Came Straight
🪞 Where is my reflection located behind the mirror? Move an object farther away and its image stays exactly the same size—tap all four distances to test it. 💧 A coin underwater looks closer to the surface than it really is: 3/4 deep in water, 2/3 deep through glass. Can you make it look 12 cm higher? 🔍 Last is a convex lens. Beyond the focal point, it makes an upside-down image; inside it, an upright, magnified one. Put the object exactly at the focal point, though, and no image appears—follow the rays to see why. All three tell the same story: light bounces and bends, but our eyes believe it traveled straight the whole way. This app was coded too · Shall we remix it and add a concave mirror?