Photoelectric Effect (Cesium)
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Cs + hν → Cs+ + e−
Visão geral
Photons with energy exceeding the work function of cesium (2.1 eV, wavelength < 590 nm) eject electrons from the metal surface. Cesium has the lowest work function of any stable element, making it the most photosensitive metal. Einstein's explanation of this effect in 1905 established the quantum nature of light and won him the Nobel Prize.
Participantes
| Papel | Substância | Coeficiente | Estado |
|---|---|---|---|
| Reagente | Cesium Cs | 1 | (s) |
Exemplo do cotidiano
Automatic doors use photoelectric sensors that detect when a person blocks a light beam, triggering the door to open.
Importância industrial
O efeito fotoelétrico é fundamental para tubos fotomultiplicadores, células solares, fotodetetores e espetroscopia eletrónica (XPS).
Propriedades
- Tipo
- Photochemical
- Reversível
- Não
- Energia
- Endotérmico