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Let's start with photons and the electronvolt.
1. The Photon
What exactly is a photon? This video shows how we can use the particle model, with individual corpuscles of energy, to explain certain properties of EM radiation.
2. The Electronvolt
In everyday life we use the joule to measure energy. When we consider the energy of individual particles or photon it is often more convenient to use a smaller unit, the electronvolt, eV.
3. Practical - Finding Planck's Constant
How to find the value of little 'h' yourself using some LEDs, a voltmeter and a variable power supply. Planck's constant is the constant of proportionality between the particle-like properties and the frequency of the associated wave.
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