The number of ejected photoelectrons increases with increase.

Correct answer: A. Increase in intensity of light

  • A. Increase in intensity of light
  • B. Increase in wavelength of light
  • C. Increase in frequency of light
  • D. Never

Explanation

The correct answer is that the number of ejected photoelectrons increases with an increase in the intensity of light. In the photoelectric effect, the intensity of light is proportional to the number of photons hitting a surface per unit time. Therefore, higher intensity means more photons are available to eject more photoelectrons. While frequency and wavelength affect the energy per photon and the ability to eject photoelectrons, they do not directly influence the number of electrons ejected. Thus, increasing the intensity leads to more ejected photoelectrons, assuming the frequency is above the threshold required to overcome the material's work function.

This question appeared on the ETEA MDCAT 2016 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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