Intro chem help Visible light spectrum? and energy of photon? help

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Discussion Overview

The discussion centers around the visible light spectrum, specifically the wavelength ranges associated with the colors of the spectrum (ROYGBIV) and the relationship between photon energy and color. Participants seek clarification on these concepts, referencing various sources and personal homework questions.

Discussion Character

  • Exploratory, Technical explanation, Homework-related, Debate/contested

Main Points Raised

  • One participant asks for the specific wavelength ranges for the colors of the visible spectrum, suggesting violet as 400-500 nm and red as 700-800 nm.
  • Another participant questions the wavelength ranges provided, offering alternative references for the visible spectrum.
  • A participant mentions a homework question regarding a wavelength of 755 nm, asserting that it corresponds to red, while expressing confusion since other sources indicate red ends at 700 nm.
  • In response, another participant suggests that 755 nm should be classified as infrared rather than red, highlighting the subjectivity in color classification.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the exact wavelength ranges for the colors of the visible spectrum, and there is disagreement regarding the classification of 755 nm light. The discussion remains unresolved.

Contextual Notes

Participants reference various sources for wavelength ranges, indicating potential discrepancies in definitions. The discussion also highlights the subjective nature of color perception.

nchin
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on a visible spectrum scale what are the numbers for the colors of ROYGBIV? for example is violet 400-500nm and red is 700-800nm? how about the other colors?

If the energy of a photon is 2.63 x 10^-19 J, how can we tell what color this is? i was looking at this electromagnetic spectrum and it doesn't help me much.
http://www.lbl.gov/MicroWorlds/ALSTool/EMSpec/EMSpec2.html

help!
 
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How people refer to color is somewhat subjective. However, I would probably call 755 nm light infrared rather than red.
 

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