PURPOSE: Model energy levels in atomic orbits.
DESCRIPTION: The steps of the ladder represent energy levels or atomic orbitals. The ball represents an electron. The light source provides a photon of energy. With a red filter the ball jumps one step; with the blue filter the electron jumps two or three steps up the ladder. Radiation with the wrong light, say green light, leaves the ball in its ground state (on the floor), because that energy would leave the ball between energy levels.
REFERENCES: (PIRA 7B50.10)
EQUIPMENT: Ladder, ball electrons, and film loop projector with red, green, and blue color filters.
SETUP TIME: 5 min.
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