(a) When an electric discharge is passed through hydrogen gas at low pressure, a bluish light is emitted. The line emission (atomic) spectrum of an element is unique. Please do not block ads on this website. The emission of photons through electronic relaxations in atoms produces a line emission spectrum. Every element has a unique atomic emission spectrum, as shown by the examples of helium $$\left( \ce{He} \right)$$ and iron $$\left( \ce{Fe} \right)$$. Spectroscopy is the study of emission and absorption spectra. Examples Line emission spectrum of H violet n6-n2 blue ng-> nz green n4 n2 Yed ng n2 Calculate the energy of the light emitted when an e- from n=4 to n= 2 goe What is the wavelength of this light ? There are two types of line spectrum: an emission spectrum and an absorption spectrum. Line spectrum can therefore be found in both absorption and emission spectra which are exact opposites of each other. Other articles where Line spectrum is discussed: spectroscopy: Basic atomic structure: The emission and absorption spectra of the elements depend on the electronic structure of the atom. No ads = no money for us = no free stuff for you! Planetary nebulae, for example, are the remnants of stars which have gently pushed their outer envelopes outwards into space. It is a sequence of lines of different color/frequency that represents a kind of "photograph" of the structure of an atom. Truly white light, like that emitted by some stars and moons is a perfect example of continuous spectrum. This hypothetical element shall have 4 energy levels. Unlike visible light which shows a continuous spectrum of all wavelengths, the emission spectra of atoms in the gas phase emit light only at specific wavelengths with dark spaces between them. An emission line will appear in a spectrum if the source emits specific wavelengths of radiation. When an absorption spectrum and emission spectrum are combined, you get a continuous spectrum with all the wavelengths. Each line represents a unique wavelength, and the entire thing is unique to that particular element. This means that the gas is receiving energy carried by the photons of light (as in E=hf). The nucleus Emission-line spectra Low-density clouds of gas floating in space will emit emission lines if they are excited by energy from nearby stars. Take for example an element, which will be named X. (b) This light shows discontinuous line spectrum of several isolated sharp lines through prism. Hydrogen spectrum is an example of line emission spectrum or atomic emission spectrum. Classical theory was unable to explain the existence of atomic emission spectra, also known as line-emission spectra. Line emission spectra (atomic spectra) can be used to identify the presence of an element in a sample because no two elements produce the same line emission (atomic) spectrum. 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