Einstein's photoelectric equation states that the maximum kinetic energy of an emitted electron is
Correct answer: B. hf minus the work function
- A. hf plus the work function
- B. hf minus the work function
- C. the work function minus hf
- D. hf multiplied by the work function
Explanation
The photon energy hf is spent first on freeing the electron from the metal, which costs the work function, and whatever remains appears as kinetic energy. If hf is less than the work function nothing is emitted at all, which defines the threshold frequency. A graph of maximum kinetic energy against frequency is a straight line of gradient h.
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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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