stem/Light.md
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STEM/CS/Language Binding.md
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$$E=hf$$
## Photoelectric Effect
- Emission of charged particles when exposed to UV light
- Electrons
- Einstein suggested light is quantised
1. The maximum KE of ejected electrons is independent of intensity, but dependent on frequency $n$
2. There is a minimum frequency n0below which there is no emission
3. No time delay (less than 1 ns) before the onset of emission but the rate of electrons depends on the intensity.
![photo-electric](img/photo-electric.png)
![fermi-vacuum-level](img/fermi-vacuum-level.png)
![em-spectrum](img/em-spectrum.png)
- Radio spectrum
- 30Hz 300 GHz