Number of photons in photoelectric effect

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Discussion Overview

The discussion revolves around the relationship between light intensity and the number of photons in the context of the photoelectric effect. Participants explore how the intensity of light correlates with photon count and the implications of this relationship in various scenarios.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • Some participants propose that for a given frequency of light, an increase in intensity corresponds to an increase in the number of photons, with a maximum of one photoelectron emitted per photon.
  • Others argue that while a specific number of photons may be expected per second, statistical fluctuations mean that the exact count can vary, particularly at lower photon numbers.
  • A later reply introduces the concept of "Shot Noise," explaining that statistical fluctuations in photon counts contribute to noise in measurements related to photometry and astrophotography.

Areas of Agreement / Disagreement

Participants express differing views on the consistency of photon counts over time, with some acknowledging statistical variability while others seem to imply a more deterministic expectation. The discussion remains unresolved regarding the implications of these fluctuations.

Contextual Notes

Limitations include the dependence on statistical averages and the conditions under which photon counts are measured, as well as the potential impact of noise in practical applications.

cbram
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Does the intensity of light mean increase no. of photons?
 
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cbram said:
Does the intensity of light mean increase no. of photons?
For a given frequency of photons it does. A maximum of one photoelectron for each arriving photon.
 
Then for instance if the light carries 21 photons per second then the next second also should carry the same amount of photons
 
cbram said:
Then for instance if the light carries 21 photons per second then the next second also should carry the same amount of photons


The equivalence is only there for statistically large numbers. You would not get 21 every second.
 
Thanks for the information
 
cbram said:
Then for instance if the light carries 21 photons per second then the next second also should carry the same amount of photons

Oh, if only! The statistical fluctuation in photons per unit of time is known as "Shot Noise" and is a major source of noise in photometry, astrophotography, and other areas.
 

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