A set of five gas discharge tubes are arranged such that when they are touched with a Tesla coil, their characteristically colored emission spectra are seen. The Tesla coil can burn your skin on ...

This causes line emission spectra to be produced, as shown below. This is not a continuous spectrum as only light of specific frequencies and specific colours are produced. Different types of ...

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 ...

The calibration process is a simple one that relies on a light source with well-defined lines. CFL bulbs are readily accessible, so they are a good choice. First, a picture is taken through the ...

This work reports the design of an efficient multiband UC system based on Ln3+/Yb3+-doped core-shell upconversion ...

Jeffery, E. Baron Publications of the Astronomical Society of the Pacific, Vol. 118, No. 842 (April 2006), pp. 560-571 (12 pages) ABSTRACT A comparative study of near–maximum‐light optical spectra of ...