This video explains an A Level Physics Practical: finding the value of Planck's constant with LEDs.
How to conduct an experiment to find the value of Planck's constant using an LED, a voltmeter and a variable power supply. Planck's constant, h, is the constant of proportionality between the particle-like properties and the frequency of the associated wave.
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Finding the Value of Planck's Constant - A Level Physics PRACTICAL
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