Negative Work function in Photo electric effect

Click For Summary

Homework Help Overview

The discussion revolves around the photoelectric effect, specifically focusing on the concept of work function as derived from a graph. Participants are examining the implications of a negative value for the work function indicated by the graph's y-intercept.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants are exploring the relationship between the graph's y-intercept and the work function, questioning whether a negative work function is valid and how it relates to the concept of threshold frequency.

Discussion Status

Some participants have provided clarifications regarding the interpretation of the graph, noting that the y-intercept represents the negative of the work function, which leads to a positive value for the work function itself. There appears to be a productive exchange of ideas, with some participants expressing understanding after receiving guidance.

Contextual Notes

There is an ongoing discussion about the definitions and implications of the work function in the context of the photoelectric effect, particularly regarding how negative values are interpreted in this scenario.

logearav
Messages
329
Reaction score
0

Homework Statement



In my attachment, the x intercept gives threshold frequency and the y intercept gives the work function.

Homework Equations





The Attempt at a Solution


Work function is the minimum energy needed to pull out an electron from the metal surface. My question is, from the graph, work function is a negative value. Will work function takes negative values?
 

Attachments

  • 17a0d8fb-7882-4256-9531-9883e39d1557.gif
    17a0d8fb-7882-4256-9531-9883e39d1557.gif
    2.6 KB · Views: 1,225
Physics news on Phys.org
logearav said:
In my attachment, the x intercept gives threshold frequency and the y intercept gives the work function.
The y intercept gives the negative of the work function. (It's even marked -Φ on the diagram.) The work function is positive.
 
Doc Al,
How negative of the work function becomes positive work function.
 
logearav said:
Doc Al,
How negative of the work function becomes positive work function.
The work function is the negative of the y-intercept. Since the y-intercept is negative, the work function is positive.
 
I got it now Doc Al. Thank you so much
 

Similar threads

  • · Replies 25 ·
Replies
25
Views
5K
  • · Replies 4 ·
Replies
4
Views
5K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 4 ·
Replies
4
Views
3K
  • · Replies 22 ·
Replies
22
Views
4K
Replies
7
Views
2K
  • · Replies 7 ·
Replies
7
Views
1K
  • · Replies 13 ·
Replies
13
Views
3K
Replies
19
Views
3K
  • · Replies 4 ·
Replies
4
Views
2K