Calculate Electron Kinetic Energy: Photon Frequency & Negative Potassium Plate

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Homework Help Overview

The discussion revolves around calculating the kinetic energy of an electron ejected from a negatively charged potassium plate when struck by a photon of a specific frequency. The problem involves concepts from quantum physics and photoelectric effect.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • The original poster expresses confusion about the physics concepts involved and seeks assistance in understanding the problem. Some participants question the poster's efforts and encourage them to utilize available resources.

Discussion Status

Participants are exploring the problem, with one individual providing a numerical answer. However, there is no explicit consensus on the correctness of the approach or the answer provided. Guidance has been offered regarding the use of external resources.

Contextual Notes

The original poster mentions a home test constraint and expresses a lack of understanding in physics, which may limit their ability to engage with the problem fully.

Aran
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A photon with a frequency of 5.8 × 1014 Hz strikes a clean, negatively charged potassium plate. The work function of potassium is 3.6 × 10-19 J. Calculate the kinetic energy of an electron ejected from the plate by this electron.

Explanation is here i think:

bbc.co.uk/scotland/education/bitesize/higher/physics/radiation/optoelectronics1_rev.shtml

I don't understand anything in physics and I have this home test, and this is the only question I need answered. If you can please help me, I would greatly appreciate it. Thank you ^^
 
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What have you done yourself? That page is very clear and basically gives you all the tools you need to answer the question.
 
I got 2.454x10^-20 J as my final answer
 
Looks ok to me.
 

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