Talk:H-alpha

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[edit] Colour of this Line?

It may not be very scientific, but could we get an image block filled with the actual colour (or the closest rgb equivalent?) 70.66.73.48 07:05, 13 December 2006 (UTC)

since your eyes are not capable of seeing this wavelength it would be redundant to show it, cause whatever you would see would just be a replacement, you could even replace it with blue or pink to make it visible for your eye. Maybe you can think of it as an X-Ray-foto, what you see there is black and white, although X-Rays don't have any visible color at all.--131.220.96.186 14:33, 13 August 2007 (UTC)

actually, 656 nm is perfectly visible to most humans (as the article already implies), but it's a long enough wavelength that the RGB equivalent is just pure red. Converting a particular wavelength into RGB is such an approximation that I'm not sure that it's useful here. 128.220.233.155 (talk) 18:38, 6 December 2007 (UTC)

[edit] Energy of this line?

I would be interested to know what quantity of energy or temperature this line relates to, and possibly how to calculate it or where to look it up. Hansschulze (talk) 08:25, 7 February 2008 (UTC)

Use Planck's Formula (E=hf) and substitute for f (f=c/λ) and work out the photon energy from there. Coatesg (talk) 15:18, 15 February 2008 (UTC)