A beam of light of wavelength "λ" and with illumination "L" falls on a clean surface of sodium. If "N" photoelectron are emitted each with kinetic energy E:
Correct answer: C. N ∝ L and E ∝ 1/λ
- A. N ∝ L and E ∝ λ
- B. N ∝ L and E ∝ L
- C. N ∝ L and E ∝ 1/λ
- D. N ∝ 1/λ and E ∝ 1/L
Explanation
In photoelectric effect Electrons are emitted instantaneously; the intensity of light determines only their numbers. N ∝ L In photoelectric effect electrons are emitted with different energies. The maximum energy of photoelectrons depends on the nature of metal surface and the frequency of incident light. E ∝ 1/λ
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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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