Light of a single frequency falls on a photoelectric material, but no electrons are emitted.On the contrary, if the electrons are to be emitted, then which of the following options willcause it?
Correct answer: A. Increase the frequency of the incident light
- A. Increase the frequency of the incident light
- B. Decrease the frequency of the incident light
- C. Increase the intensity of the incident light
- D. Use a different material with a higher work function
Explanation
The photoelectric effect occurs when photons with energy equal to or greater than the material's work function strike the surface and release electrons. Increasing the frequency of the incident light will increase the energy of the photons, potentially allowing them to overcome the work function and emit electrons. Decreasing the frequency or increasing the intensity does not increase the energy per photon and hence does not help in electron emission. Using a material with a higher work function would require even higher frequency light for electron emission.
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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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