# Calculate wavelength from a known distance and color for Helium

Hi all!

I just joined the forums and hopefully my question is in the right place and isn't a lame one but I'm stuck so here goes:

I want to know how to calculate wavelength from a known distance and color for Helium. I need exact wavelength. I already have the ranges obviously. Usually it's wavelength=c/v but I don't have frequency so any help would be greatly appreciated. Thanks.

:)

What do you mean by distance?
Also color is frequency... so presumably if you know one - you know the other.

What do you mean by distance?
Also color is frequency... so presumably if you know one - you know the other.

sorry, I just realized that I was given a chart of Helium Wavelengths and the distances are to be used for something else:

447.1
468.6
471.3
492.2
501.6
587.6
667.8
706.5

I have six colors: violet, Blue, Green, Orange, Yellow, and Red which all have ranges.
violet: 380-420
blue: 440-470
green: 500-520
orange: 580-620
yellow: 550-580
red: 620-700

I think I am supposed to pick the wavelength from the given chart based on these ranges. Most work except for yellow. Yellow is in 550-580 and I don't see a wavelength that would fit in this range that is given above. And I must have six colors so I can't ignore the yellow.

what about the 587.6, its pretty close?

Yeah I guess, I will have to use that. I don't see another option. Thanks anyway, i guess this doesn't really count as a legitimate question; more of a weird data setup issue.

:)