Discover the Maximum Wavelength of M101 Visible to the Naked Eye

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The maximum wavelength of M101 visible to the naked eye is approximately 700 nm, which corresponds to the red part of the spectrum. The H-alpha emission line, known for its intensity, is significant in this context. There is some confusion regarding whether the discussion pertains to the longest wavelength or the brightest wavelength. Clarification indicates the focus is on the longest wavelength. Understanding these wavelengths is crucial for astronomical observations.
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What is the maximum wavelength of m101 seen from the Earth by eye?
 
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Do you mean longest wavelength? If so, that would be red (~700 nm). The H-alpha is the most intense emission line.

http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?letter=.&classic=YES&bibcode=1985AJ...90..192D&page=&type=SCREEN_VIEW&data_type=PDF_HIGH&send=GET&filetype=.pdf

If you mean brightest wavelength, I haven't a clue.
 
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longest, thanks
 

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