Photoelectric Effect: Threshold Frequency Explained

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Discussion Overview

The discussion revolves around the concept of threshold frequency in the photoelectric effect, exploring the conditions under which electrons are ejected from a material and the energy dynamics involved in this process. Participants express doubts and seek clarification on the relationship between photon energy, threshold frequency, and the kinetic energy of ejected electrons.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant questions the concept of threshold frequency, specifically asking where the leftover energy goes when an electron is ejected.
  • Another participant explains that the threshold frequency corresponds to the energy required for an electron to overcome the work function of the material, suggesting that the leftover energy contributes to the kinetic energy of the ejected electron.
  • A third participant reiterates the question about the leftover energy, implying a need for further clarification on the relationship between photon energy and the kinetic energy of the electron.
  • A brief mention of "W" is made, indicating a potential inquiry into the work function or energy considerations related to the photoelectric effect.

Areas of Agreement / Disagreement

Participants express differing views on the specifics of energy transfer during the photoelectric effect, with some proposing that leftover energy contributes to kinetic energy while others seek further clarification on this point. The discussion remains unresolved regarding the complete understanding of these energy dynamics.

Contextual Notes

There are unresolved aspects regarding the definitions of terms such as "threshold frequency" and "work function," as well as the specific energy dynamics involved in the ejection of electrons.

Vivan Vatsa
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I have studied photoelectric effect. I have many doubts regarding that, so firstly, I cannot understand when, THRESHOLD FREQUENCY arises. " Threshold frequency is the frequency at which the electron gets ejected from the electrode & runs toward the other negatively charged electrode " , so my question is

When we are applying energy & we know that the electron will get ejected at Threshold Frequency, then where the left over energy goes?
 
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At that frequency (red border of photoeffect) of specific material is frequency by which the energy of photon is equal to exiting work of material,in other words electron has to receive at least that amount of energy to relase itself from surface so i think the subject or your interest would be the existing work of material that's the energy the electron loses through his way to relase that surface(electrode) because as einstein showed:Ek= hf-A.
q.e.d
 
Vivan Vatsa said:
When we are applying energy & we know that the electron will get ejected at Threshold Frequency, then where the left over energy goes?
The "left over" energy goes into the kinetic energy of the ejected electron. If the energy of the photon is only slightly above the threshold energy, the electron will be moving less quickly than if the photon energy is well above the threshold energy.
 
What about W?
 

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