Mon June 11, 2012 By: Priyankar

why the line spectrum can be seen instead of continious spectrum though electrons are revolving around the nucleas continiously?

Expert Reply
Fri June 15, 2012
When an atom of a gas released energy, an electron would move down to a lower orbit (requiring less energy), and when an atom acquired energy, an electron would move up to a higher energy level.  But these orbits or shells were discrete, like the distances from the sand castle.  The orbits were not a smooth, continuous series of possibilities as one finds in the everyday world, but rather a set of distinct states separated from each other, much like the separation of the quanta of electromagnetic radiation that Planck had discovered.  This caused the distinct lines in the spectrum.
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