The threshold wavelength for a metal whose work function is Wo is λo. What is the threshold wavelength for a metal whose work function is Wo /2?
Correct answer: C. 2 λo
- A. λo/4
- B. λo/2
- C. 2 λo
- D. 4 λo
Explanation
The explanation is given below: Work function = Wo = hc/λoIf work function is Wo/2 = hc/λ1Then λ1 = 2λ0
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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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