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THE WORK OF BOHR In order to understand Bohr ’s model we need to unders tand the nature of light. The visible spectrum is a form of energy that makes up a very small portion of the electromagnetic spectrum. A narrow beam of white light passing through a prism will yield a blended pattern of colours called a continuous spectrum. The colours always appear in the same order violet (400nm wavelength) to red (700nm wavelength) with no dividing lines. The visible spectrum sits between infrared radiation and ultraviolet radiation in the EM spectrum. We cannot see radiation outside the visible spectrum. Bohr applied electricity and thermal energy to hydrogen gas. He noticed that the gas began to emit light, but only a few precise wavelengths of light, called a line spectrum. Each line in the spectrum corresponds to a specific wavelength. Bohr developed his model of the atom by studying this spectrum. When the electron in the hydrogen atom is in its lowest energy level (closest to the nucleus) it is said to be in ground state. An electron is in ground state if it is in the lowest possible energy level. An atom

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