when an electrical discharge is passed through a sample of hydrogen gas at low pressure, a pinkish glow is observed. This glow can be examined using a simple spectroscope. A number of separate lines can be observed. It is important to realize that each line in the spectrum corresponds to an electron’s changing from one energy level to another.
When electrical discharge is passed through hydrogen gas, energy is absorbed, and the electron in the first energy level is promoted to a higher energy level.This electron may then drop back to a lower level releasing energy in the form of electromagnetic radiation.This released energy is related to the frequency of the radiation by the formula:
E2-E1 = hν
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