Observing light from distance

[u2_wa]

Which visible light frequency i.e red, yellow , green etc can be seen from greatest distance? and why?

 

[Danger]

Welcome to PF, U2_wa.
The answer to your question is primarily dependent upon who or what is doing the observing. Different sensors have different ranges of sensitivity to various frequencies.

 

[pallidin]

Yellow. I believe that's the human eyes' most sensitivity to "color"

 

[Nabeshin]

Yellow. I believe that's the human eyes' most sensitivity to "color"

Human eye sensitivity is actually peaked in the green, ~550nm.

 

[pallidin]

Thanks. I learn something new each day, especially here at PF!

 

[Tea Jay]

Some people perceive 550 nm as a greenish yellow/yellowish green.