What wavelength corresponds to the Hydrogen-alpha ($ ext{H} extalpha$) emission line?

Answer

656.3 nanometers

The photon released during the $ ext{H} extalpha$ transition has a specific wavelength of 656.3 nanometers, which falls squarely in the deep red portion of the visible spectrum.

What wavelength corresponds to the Hydrogen-alpha ($	ext{H}	extalpha$) emission line?

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