Labs & Lending Library
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Nanophysics
Atomic Force Microscopy
Resistance of Atomic Wires
Imaging Atoms (Demonstration)
Waves
Audio Crime Lab
Resonance in Transverse Waves
Diffraction of Light
Clearly Colorful Thin Films
Exploring Wave Phenomena
Arecibo's Giant Mirror
Doppler Effect
Resonance in Longitudinal Waves
Electricity and Magnetism
Water Analogy to Electric Circuits
Discovering Ohm's Law
Too Cool to Resist
Magnetic Force on a wire with current
Biocircuits
Foutan Board
Snap, Crackle and Pop
Nature of Resistance
Power to the People
Quantum Physics
Bohr Model Game
The Phantastic Photon
Light Emitting Diodes
Mechanics
Double Pendulum
Mousetrap and Ping Pong Balls
The Physics of Rock Climbing
Vortex Rings
Stunt Car Challenge!
The Physics of Baseball
Particle Physics
Cloud Chamber and Cosmic Rays
Optics
Communicating with Light
Is the Light Bulb Too Good to be True?
Measuring the Speed of Light
Energy
Energy Conversion in a Light Bulb
Other
Introduction to Graphing
Introduction to the Oscilloscope
DNA Diffraction and DNA Structure
Light Emitting Diodes
Authors: Preeti Chalsani, Ralph Greco
Lab Manual: 
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Kit: Reserve
Abstract: Light emitting diodes (LEDs) are increasingly being used as indicators in electronic devices and as efficient light sources such as traffic lights. Using super-bight LEDs, students investigate the conversion of electrical energy into light and vice versa. By measuring and comparing the energy lost by each electron with the frequency of the emitted light for several LED colors students estimate Plank's constant, a fundamental number of quantum mechanics.
