1. Light as particles
Day 9

2. Light acting as a particle
When you shine light on a substance, say sodium, you can excite the electrons
As we saw with the ionization energy of hydrogen, energy can cause electrons to leave the atom
How much energy does it need? How does that energy need to be applied?

3. Experimental Setup Why is there a battery in the circuit?
What could you measure with this battery?
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4. Photoelectric effect observations