When an incident light is targeted to a metallic surface, photoelectrons are ejected as a result.The number of photoelectrons ejected are
Correct answer: D. Directly proportional to the intensity of the incident light.
- A. Inversely proportional to the frequency of the incident light.
- B. Directly proportional to the frequency of the incident light.
- C. Inversely proportional to the intensity of the incident light.
- D. Directly proportional to the intensity of the incident light.
Explanation
In the photoelectric effect, the number of photoelectrons ejected from a metallic surface is directly proportional to the intensity of the incident light. This is because the intensity of light refers to the number of photons hitting the surface per unit time. More photons mean more chances for photoelectrons to be ejected.Option A is incorrect because the frequency of light affects the energy of the ejected photoelectrons, not their number. Option B is incorrect for the same reason. Option C is incorrect because increasing light intensity increases, not decreases, the number of ejected photoelectrons.
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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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