Quantum Question: Max Kin Energy & Speed of Electron

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Homework Help Overview

The problem involves the interaction of light with a metallic surface, specifically focusing on the photoelectric effect. It addresses the maximum kinetic energy of emitted electrons and their speed after a retarding potential is applied, with relevant parameters including wavelength and work function.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to apply the kinetic energy equation but expresses uncertainty about how to approach the second part of the problem regarding speed. Some participants discuss the conservation of energy and the implications of the retarding potential on the electron's potential energy.

Discussion Status

Participants are engaging with the original poster's attempts, providing guidance on the concepts involved. There is an emphasis on understanding rather than providing direct solutions, with some questioning the implications of the retarding potential.

Contextual Notes

The discussion highlights the constraints of forum rules that prevent direct solutions, emphasizing a learning-focused approach. The original poster seeks examples for better understanding, indicating a need for clarification on the application of concepts.

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Homework Statement


Light with a wavelength 600 nm is directed at a mettalic surface with a work function of 1.6 eV. A retarding potential of 0.5 V is applied. Determine:
a) The maximum kinetic energy, in joules, of an emitted electron before the retarding potential is applied.
b) The maximum speed with which an electron reaches the far side after the retarding potential is applied.

Homework Equations

[/B]
Kinetic Energy = hf - w

The Attempt at a Solution


I used the above equation to figure out "a" but, I do not know where to begin question "b."
 
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The energy of the electron is conserved during its flight. Retarding potential means that it travels toward an electrode at negative potential with respect to the metallic surface. How much does the potential energy of the electron change?
 
Oh I see but can you please do it for me I just want a solid example to follow in the future.
 
DarkKnight911 said:
Oh I see but can you please do it for me I just want a solid example to follow in the future.
I can not do it for you, the rules of the Forums forbid it. We only can lead you.

Do you know what is the potential energy of a charge q at a point with potential U?
 

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