Activity/Demo Title: Quantum Plinko Board
Activity/Demo overview:
The plinko board is a classic demonstration of probability distribution curves. As it turns out, quantum mechanics is itself a probabilistic theory! Unobserved quantum states reside in a superposition of states and only collapse to a definite state upon observation. This fuzzy nature of particles is displayed in the plinko board. When the board is covered, the audience loses sight of the puck bouncing down the board. The puck, being our analog to a particle, is in a superposition of states. This kind of demo and analogy provides insight and context to the nature of particles and reality.
Activity/Demo Instructor Notes:
First, make sure the board is symmetric to display a true probability distribution curve. The plinko board should be tilted by a few degrees to prevent the puck from bouncing out of the board. We found that a lighter puck is bouncier and more exciting. For a cover one can use simple coat hangers to hang something over the board.
To run the demo first show normal use of the plink board uncovered. Explain the definiteness of the location and state of the puck in a classical physics sense. Proceed to cover the board and introduce the idea of the puck as a particle. Explain that with the board covered we don’t know the state of the puck/particle and that upon observation it could take on any of the final states. For fun you can have audience members drop the puck and give out prizes.