Black hydrogen absorption lines are at the same wavelength as the bright hydrogen emission lines. Key fact Line emission spectra are unique to a particular element. Different elements produce ...

This collects RF signals and directs them to the waveguide, built from a rectangular paint thinner can with a quarter-wavelength stub ... designed for the hydrogen line, some preamps, a bandpass ...

Since it has a wavelength of about 21 centimeters, the hydrogen emission line is sometimes called the 21-cm line. Neutral ...

We engraved this on the Clipper plate, along with a frequency called the hydroxyl line. We displayed the hydrogen and hydroxyl lines using their wavelengths in the Clipper message. The metal plate ...

They used cocatalysts strategically to improve generating hydrogen and oxygen. They achieved a quantum efficiency of nearly 100 percent for ultraviolet rays with wavelengths of 350 to 360 nanometers.