The emission spectrum is the set of light frequencies emitted by substances after they
have been excited with various forms of energy, most commonly heat or electrical. Since the
frequency of light emitted under these conditions depends on the energies of the excited and
ground states of electrons in the atoms, the spectrum serves as a very sensitive “fingerprint” of
the atoms present. For example, by studying emission spectra of the stars, we can determine
their chemical composition. Also, emission spectra are used to identify poisons in food,
pesticides in the environment, and numerous substances in forensic samples.
Although emission spectroscopy has many practical uses, it is equally interesting because
it provided the first quantitative information about the energy levels in atoms, and allowed
chemists to calculate values for the allowable energies of electrons in atoms.
The Bohr equation (named after Danish physicist, Niels Bohr):
The emission spectrum is the set of light frequencies emitted by substances after theyhave been excited with various forms of energy, most commonly heat or electrical. Since thefrequency of light emitted under these conditions depends on the energies of the excited andground states of electrons in the atoms, the spectrum serves as a very sensitive “fingerprint” ofthe atoms present. For example, by studying emission spectra of the stars, we can determinetheir chemical composition. Also, emission spectra are used to identify poisons in food,pesticides in the environment, and numerous substances in forensic samples.Although emission spectroscopy has many practical uses, it is equally interesting becauseit provided the first quantitative information about the energy levels in atoms, and allowedchemists to calculate values for the allowable energies of electrons in atoms.The Bohr equation (named after Danish physicist, Niels Bohr):
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