Photoelectric Effect (Cesium)
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Cs + hν → Cs+ + e−
Tổng quan
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.
Người tham gia
| Vai trò | Chất | Hệ số | Trạng thái |
|---|---|---|---|
| Chất phản ứng | Cesium Cs | 1 | (s) |
Ví dụ thực tế
Automatic doors use photoelectric sensors that detect when a person blocks a light beam, triggering the door to open.
Tầm quan trọng công nghiệp
The photoelectric effect is fundamental to photomultiplier tubes, solar cells, photodetectors, and electron spectroscopy (XPS).
Tính chất
- Loại
- Photochemical
- Thuận nghịch
- Không
- Năng lượng
- Thu nhiệt