Cesium coated oxidised silver emits electrons for _ light.
Correct answer: A. Infrared.
- A. Infrared.
- B. Ultraviolet.
- C. Visible.
- D. Green.
Explanation
In photocell cesium, coated oxidised silver cathode emits electrons for infrared light.
This question appeared on the UHS MDCAT 2008 paper, which you can sit online with every answer explained.
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About Photons and the Particle Model of Light
The particle model treats light as photons with energy E equals hf and momentum related to wavelength. Questions involve the photoelectric effect, work function, threshold frequency, stopping potential and photon energy, while distinguishing particle behaviour from the wave description of interference and diffraction.
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