THE colour of the light which is emitted from the capillary of a vacuum tube containing pure hydrogen is the familiar vivid, deep pink, the prevailing tint being due to the predominating ...

The light from each star is directed through a prism to produce a spectrum. Each of the spectra has a set of absorption lines created by the presence of hydrogen in the stars' atmospheres.

It featured a molecular hydrogen lamp, a monochromator made of a Brazilian quartz prism, and a UV-sensitive phototube. Light from the lamp passed through a series of slits and mirrors and separated ...

When a gas is very hot, it doesn’t emit all wavelengths of light. Hot gases don’t produce a continuous emission spectrum. Black hydrogen absorption lines are at the same wavelength as the ...

A CONTINUOUS radiation from hydrogen beginning in the blue violet ... shows no unusual intensity at the corresponding shade in the spectrum.