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1An emission spectrum consisting of separate isolated lines.
‘(the numbers above each cell line indicate the number of times that cell line spectrum was significantly different in a pair-wise comparison).’
1.1An emission (of light, sound, or other radiation) composed of a number of discrete frequencies or energies.
‘To measure the line spectra, researchers shine light over a large range of wavelengths through a very long column of water.’
‘The line spectrum of an atom - even a simple hydrogen atom with only one electron - can be very complex.’
‘The loss of that same finite amount of energy by energetic electrons explains the bright line spectra emitted by glowing gases, such as neon.’
‘According to Bohr, transition between energy levels explained the line spectrum: when an electron dropped to a lower energy level, the lost energy was emitted in the form of a photon, or particle of light.’
‘This task is complicated by the multitude of chemical compounds in the interstellar medium and the elemental line spectra in the originating star light.’