The minimum frequency of incident light required to emit photoelectrons from the metal surface is called:
Correct answer: B. Threshold frequency
- A. Critical frequency
- B. Threshold frequency
- C. Work function
- D. None of the above
Explanation
This minimum frequency is also called the threshold frequency, and the value of ν0 \nu, start subscript, 0, end subscript depends on the metal. For frequencies greater than ν0 \nu, start subscript, 0, end subscript, electrons would be ejected from the metal.
This question appeared on the ETEA MDCAT 2013 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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