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Explain emission lines and absorption lines. |
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Answer» Solution :When an electron in an atom transits from a HIGHER energy state to a lower energy state then in both the states they produce light (photon) with corresponding energy difference which produces coloured bright lines. These coloured lines get a spectrum of wavelengths or FREQUENCY that are sorted according to the pattern. The lines of the spectrum OBTAINED in this way are called emission lines. When an electron in a atom transits from a lower energy state to a higher energy state so the electron absorbs the photon having the same energy difference between two states. This process is called absorption. Thus if photons with a continuous range of frequencies pass through a rarefied gas and then are analysed with a spectrometer, a series of dark spectral absorption LINE appear in the continuous spectrum. The dark lines indicate the frequencies that have been absorbed by the atoms of the gas. |
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