How Much Energy Does an Electron Retain from Blue-Green Light?

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Homework Help Overview

The discussion revolves around the energy retention of an electron in metallic cesium when exposed to a photon of blue-green light, specifically with a wavelength of 5x10^-7 m. The original poster presents a scenario involving the absorption of a photon and its implications for the electron's energy after escaping the metal.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants explore the reasoning behind the color classification of the light and its wavelength. Questions are raised about the mathematical justification for the color identification and comparisons of photon energies.

Discussion Status

The discussion is ongoing, with participants questioning each other's reasoning and seeking clarification on the energy comparisons between different wavelengths of light. There is an exploration of the implications of the original poster's assumptions regarding energy retention.

Contextual Notes

Participants are considering the definitions of light color in relation to specific wavelengths and the energy dynamics involved in the photoelectric effect, while also addressing the original poster's assumptions about energy retention.

Marcus James
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Homework Statement



If an electron in metallic cesium absorbs a photon of red light (6.6x10^-7) m in vacuum), all the energy is used up in escaping from the attractive forces in the metal. Suppose light with 5x10^-7 is used, what percentage of the photon's energy does the electron retain after it has escaped from the metal? What color light is this?

Homework Equations

The Attempt at a Solution



I believe the light color would be that of Blue-Green.[/B]
 
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And why do you think that? Do you have any math to support it?
 
Because Blue-Green is the medium between Blue (4.5-5)x10^-7 and Green (5.0-5.7)x10^-7, as the light in this example is 5x10^-7, so it falls between the two. Have you any though on the first question?
 
Marcus James said:
Have you any though on the first question?
How do the energies of the two photons compare?
 

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