If frequency of incident radiation in photoelectric effect is increased beyond threshold frequency, it will effect:
Correct answer: A. Stopping potential
- A. Stopping potential
- B. Maximum kinetic energy of Photoelectron
- C. Photoelectric current
- D. Both (A) & (B)
Explanation
If the frequency of the incident radiation in the photoelectric effect is increased beyond the threshold frequency, it will affect the stopping potential. The stopping potential refers to the minimum potential difference required to stop the flow of photoelectrons in a photoelectric experiment. When the frequency of the incident radiation is increased beyond the threshold frequency, the kinetic energy of the emitted photoelectrons increases. As a result, a higher stopping potential is needed to counteract this increased kinetic energy and stop the photoelectrons.
This question appeared on the KMU Centralized Admission Test 2021 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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