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An emission spectrum is seen as a series of differently coloured lines on a black background. Suggest how this observation provides evidence for discrete electron energy levels in atoms.
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A photon is a packet of energy of electromagnetic radiation. It is the smallest possible amount (or quantum) of electromagnetic energy. A photon carries energy that is directly proportional to its frequency , the energy is given by the equation:
where is Planck’s constant.
An emission spectrum has emission lines of different colours on a black background. Each line corresponds to one wavelength or frequency. This shows that each line corresponds to a discrete amount of energy according to the formula of energy of a photon, which is given as:
where is Planck's constant and is the frequency.
Since the energy of each line corresponds to the specific energy change between energy levels of electrons in the atom of the element emitting the light, we can therefore conclude that this observation provides evidence for discrete electron energy levels in atoms.
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that is directly proportional to its frequency 
, the energy is given by the equation:
is Planck’s constant.
