In a photoelectric effect experiment the stopping potential is:
Correct answer: D. the electric potential that causes the electron current to vanish
- A. the energy required to remove an electron from the sample
- B. the kinetic energy of the most energetic electron ejected
- C. the potential energy of the most energetic electron ejected
- D. the electric potential that causes the electron current to vanish
Explanation
The stopping potential is that retarding voltage for which the photoelectric current becomes zero. Even the electrons of maximum K.E. are not able to reach collector plate.
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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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