The ejection of photoelectrons increases due to an increase in the
Correct answer: C. Intensity of light source.
- A. Velocity of photons.
- B. Threshold frequency.
- C. Intensity of light source.
- D. Frequency of light source.
Explanation
In the photoelectric effect, the number of photoelectrons ejected from a material is increased by increasing the intensity of the light source. This is because a higher intensity means more photons are incident on the material, leading to more potential photoelectron ejections. The velocity of photons, or the speed of light, is constant and does not impact this process. The threshold frequency is a fixed property of the material and only determines the minimum frequency needed to start releasing electrons. Increasing the frequency of the light source can increase the kinetic energy of the ejected photoelectrons but not their number unless the intensity is also increased.
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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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