Work function depends on:
Correct answer: C. Both metals and nature of surface
- A. Structure of metals only
- B. Nature of surface only
- C. Both metals and nature of surface
- D. Threshold frequency
Explanation
Work functions depend on the 'structure' and 'chemical composition of a surface'. For example, different crystallographic surfaces of the same metal or compound can have substantially different work functions. According to the formula work function = h x threshold frequency, work function depends on threshold frequency. However, threshold frequency itself depends on the nature of the material surface. So overall, work function depends on the nature and composition of a material surface.
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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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