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Negative Work function in Photo electric effect

  • Thread starter logearav
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  • #1
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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?

Homework Statement





Homework Equations





The Attempt at a Solution

 

Attachments

Answers and Replies

  • #2
Doc Al
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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.
 
  • #3
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Doc Al,
How negative of the work function becomes positive work function.
 
  • #4
Doc Al
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1,111
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.
 
  • #5
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I got it now Doc Al. Thank you so much
 

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