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I believe it to be the Balmer Series.
Red, blue, green, and violet are found in the emission spectrum of hydrogen.
It is the spectrum of visible light, which has the colors of the rainbow.
white light
The colors you see in a rainbow Continuous spectrum :)
White light
Basically, energy is emitted when an electron falls from a higher energy level to a lower energy level. Such energy is emitted as electromagnetic waves, which in certain cases can be visible light.
Bohr did not discover protons, neutrons, or electrons. Bohr used the energy changes in line emission spectra to develop a model that accounted for discrete energy changes. He used the signature spectra of hydrogen to design a model of a Hydrogen atom that showed the possible jumps that an electron could make after absorbing and then releasing energy. Some of the jumps create the visible bands we see by breaking down the light of glowing Hydrogen, while other jumps, non-visible, would still be created in the Electromagnetic Spectrum according to the energy changes of an electron jumping from outer electron rings to inner electron rings.
in the visible light range
presence of various gasses. when a single index of refraction in the material. The visible spectrum is produced.
There are spaces in the atomic spectrum of hydrogen because there are discrete energy levels that the electron in the hydrogen atom can be located in. Generally speaking the further away from the nucleus, the higher the potential energy of the electron. When hydrogen gas is excited, the electron can jump up to higher energy levels. When that electron falls back down to a lower energy level, a photon is emitted with an energy equal to the energy difference between the atomic orbital it jumped from and the one it jumped to. Since excited electrons can make a number of different jumps (ex. 4->3, 4->2, 5->3, 5->2, etc) there are a series of photons given off with discrete energies. Each one of these photons has a distinct wavelength (given by the equation E=hf, where E is the energy of the photon, h is planck's constant and f is the frequency of the photon). Each line you see on the spectrum is a photon produced from a different energy jump, with a different wavelength. We are only able to see the photons that emit a wavelength in the visible spectrum (roughly 400-700 nm).
The visible spectrum.