## BIG IDEA
- 1905 was the *annus mirabilis* for physics (Miracle year) in which Albert Einstein published four papers. These papers explained the photoelectric effect, evidence of the atom, and the theories of relativity.
## Annus Mirabilis
2. Applied [[Max Planck|Max Planck's]] work the [[Photoelectric Effect|photoelectric effect]].
- established the energy of the light [[Quanta|quanta]], $E=hf$
3. Calculated the probabilities of Brownian motion, thus deriving the size of the atom.
4. Proposed [[Special Relativity|Special]] and [[General Relativity]].
- spacetime
- length contraction
- time dilation
- mass-energy equivalence
- black holes
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