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Yes, the color of light is determined by wavelength. This can be seen directly on page 6 in the textbook. There are something called spectral lines, which were discovered by Johann Balmer, that are light rays that are emitted when electrons are excited from one energy level to the next. The color of these lines are also determined by wavelength as well and they can be viewed for Hydrogen on page 7 in the textbook.
Light is made up of wavelengths of light, each with their own color. This region is visible light. In the atomic Spectra, an electric current is passed through a low-pressure sample of hydrogen gas. The electric field strips off electrons from the H2 molecules. These then form energetically excited hydrogen atoms and recombine to form H2 molecules. When white light is passed through a prism, a continuous spectrum of light results because white light consists of all wavelengths of visible radiation. When the light emitted by excited hydrogen atoms is passed through a prism, the radiation is found to consist of spectral lines
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