Photoelectric effect and work function

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Homework Help Overview

The discussion revolves around the photoelectric effect, specifically focusing on the relationship between work function and frequency as illustrated in a provided graph. Participants are examining how different plots correspond to varying work functions and the implications of the graph's slope.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the interpretation of the graph, particularly identifying which plot represents the lowest work function and the significance of the slope in relation to Planck's constant. There is some confusion regarding the graph's details and the relationship between kinetic energy and frequency.

Discussion Status

Some participants express understanding of the graph and its implications, while others seek clarification on specific points. Guidance has been offered regarding the interpretation of the slope and its relation to Planck's constant, indicating a productive direction in the discussion.

Contextual Notes

One participant notes uncertainty about the graph's details, which may affect their interpretations. The discussion also touches on the relationship between backing volts, frequency, and intensity, suggesting further exploration of these concepts.

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Homework Statement



a. Which plot on the graph represents the metal with the lowest work function?

b. What does the slope of the graphs represent? (graph is attached)

Homework Equations



threshold frequency= work function/ planks constant

The Attempt at a Solution



a. the lower the work function, the lower the frequency, so (im still confused about the graph)
so plot 1 is the one with the lowest work function.
b. the slope on the graph shows the amount of energy frequency that it took for a photoelectric effect to occur.

im not to sure about my answers someone help out please.
 

Attachments

  • PhyU08gradegraph.gif
    PhyU08gradegraph.gif
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I can't see the graph but if its kinetic energy versus frequancy then there will be a straight line relationship.

T = h\nu -\phi

Compare that with the equation of a straight line y=mx+c.
 
o ok i got it
i understand the graph now. it is a kinetic energy vs frequency graph.

a. the plot with the lowest work function is 1, because it supports the least amount of frequency. The one that supports the least amount is the one that causes a photoelectric effect first
b. the three slopes are equal to Planck's Constant which shows that the energy to frequency relation is constant for all materials. It also shows the difference between each one and compare how much threshold frequency they each support.

how is that?
 
Looks good. For b all you need say is it represents Planck's constant.
 
alright thank you
 
Explain why the backing volts depends on the frequency of light but not on the intensity.
 

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