Stopping potential for a metal surface in case of photoelectric emission depends on_____________?
Correct answer: C. the frequency of incident light and work function of the metal surface
- A. the threshold frequency for the metal surface
- B. the intensity of incident light
- C. the frequency of incident light and work function of the metal surface
- D. all of the above
Explanation
The stopping potential satisfies eVs = hf - Φ = h(f - f0), so it depends on the incident frequency and the metal's work function, or equivalently its threshold frequency. It does not depend on intensity, which changes the photoelectric current rather than the energy of each electron. Students may choose d by assuming brighter light makes electrons more energetic.
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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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