In the photoelectric effect, the stopping potential is the voltage that
Correct answer: A. just prevents the most energetic photoelectrons from reaching the collector
- A. just prevents the most energetic photoelectrons from reaching the collector
- B. starts the emission of electrons
- C. doubles the photocurrent
- D. equals the work function in volts
Explanation
Applying a retarding voltage reduces the photocurrent, and the value that cuts it to zero measures the maximum kinetic energy directly, since that energy equals the electronic charge multiplied by the stopping potential. The stopping potential depends on frequency but not on intensity. Plotting it against frequency is the classic experiment for finding Planck's constant.
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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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