Photoelectric Effect - Maximum Wavelength

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SUMMARY

The discussion centers on the photoelectric effect, specifically the relationship between light wavelength and electron emission from a metal surface. Light with a wavelength of 450 nm successfully emits electrons, while light at 650 nm does not. This phenomenon occurs because the energy of the photons at 450 nm exceeds the metal's work function, while the energy at 650 nm is insufficient. The threshold frequency is directly related to the threshold energy required for photoelectric emission, as established in quantum mechanics.

PREREQUISITES
  • Understanding of the photoelectric effect
  • Knowledge of photon energy calculations
  • Familiarity with the concepts of wavelength and frequency
  • Basic principles of quantum mechanics
NEXT STEPS
  • Study the relationship between photon energy and wavelength using the equation E = hc/λ
  • Explore the concept of work function in different metals
  • Learn about the threshold frequency and its implications in the photoelectric effect
  • Investigate experimental setups for demonstrating the photoelectric effect
USEFUL FOR

Students of physics, educators teaching quantum mechanics, and researchers interested in the applications of the photoelectric effect in modern technology.

LotusTK
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Hi, I am currently revising photoelectric effect, and i have this question:

A metal surface at zero potential emits electrons from its surface if light of wavelength of 450 nm is directed at it but not if light of 650nm is used. Explain why photoelectric emission happens with light of wavelength 450nm but not with light of wavelength 650nm

All i know is that the wavelength must be below a certain maximum value equal to the speed of light divided by the threshold frequency.

I don't know why this is, can someone explain why? Thanks.
 
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